From b97927230533040bdab94444c7b5672bcf7a4558 Mon Sep 17 00:00:00 2001
From: Bob Nystrom <robert@stuffwithstuff.com>
Date: Sun, 5 Jan 2014 12:27:12 -0800
Subject: [PATCH] Clean up text handling a bit:

- Rename IO.write -> IO.print.
- Make IO.write not print a newline.
- Support \u Unicode escapes in strings.
---
 benchmark/binary_trees.wren                   |    8 +-
 benchmark/fib.wren                            |    4 +-
 benchmark/for.wren                            |    4 +-
 benchmark/method_call.wren                    |    6 +-
 corelib.wren                                  |    8 +-
 example/hello.wren                            |    2 +-
 src/wren_compiler.c                           |   68 +-
 src/wren_core.c                               |   14 +-
 test/and.wren                                 |   28 +-
 test/assignment/associativity.wren            |    6 +-
 test/assignment/global.wren                   |    8 +-
 test/assignment/local.wren                    |    8 +-
 test/assignment/syntax.wren                   |    8 +-
 test/bool/equality.wren                       |   36 +-
 test/bool/not.wren                            |    6 +-
 test/bool/to_string.wren                      |    4 +-
 test/bool/type.wren                           |    8 +-
 test/break/in_for_loop.wren                   |    4 +-
 test/break/in_while_loop.wren                 |    4 +-
 test/break/nested_loop.wren                   |    4 +-
 test/class/equality.wren                      |   16 +-
 test/class/name_inside_body.wren              |    4 +-
 test/class/new.wren                           |    2 +-
 test/class/type.wren                          |    6 +-
 test/closure/assign_to_closure.wren           |    8 +-
 .../close_over_function_parameter.wren        |    2 +-
 test/closure/close_over_method_parameter.wren |    2 +-
 test/closure/closed_closure_in_function.wren  |    2 +-
 test/closure/closed_closure_in_method.wren    |    2 +-
 test/closure/nested_closure.wren              |    6 +-
 test/closure/open_closure_in_function.wren    |    2 +-
 test/closure/open_closure_in_method.wren      |    2 +-
 .../reference_closure_multiple_times.wren     |    4 +-
 test/closure/reuse_closure_slot.wren          |    2 +-
 test/closure/use_global_in_function.wren      |    2 +-
 test/closure/use_global_in_method.wren        |    4 +-
 test/comments/block.wren                      |    4 +-
 test/comments/block_at_eof.wren               |    2 +-
 test/comments/line_at_eof.wren                |    2 +-
 test/comments/unicode.wren                    |    2 +-
 test/comments/unterminated_block.wren         |    2 +-
 test/comments/unterminated_nested_block.wren  |    2 +-
 test/constructor/default.wren                 |    4 +-
 test/constructor/infix_class_expression.wren  |    2 +-
 test/constructor/new.wren                     |   10 +-
 test/constructor/superclass.wren              |   18 +-
 test/empty_block.wren                         |    2 +-
 test/field/closure.wren                       |    4 +-
 test/field/default_to_null.wren               |    2 +-
 test/field/multiple.wren                      |   10 +-
 test/field/nested_class.wren                  |    6 +-
 test/field/object_reference.wren              |    2 +-
 test/field/use_before_set.wren                |    2 +-
 test/for.wren                                 |    6 +-
 test/for/close_over_loop_variable.wren        |    4 +-
 test/for/closure_in_body.wren                 |    2 +-
 test/for/for_in_syntax.wren                   |    6 +-
 test/for/only_evaluate_sequence_once.wren     |    4 +-
 test/function/empty_block.wren                |    2 +-
 test/function/equality.wren                   |   20 +-
 test/function/parameters.wren                 |   34 +-
 test/function/syntax.wren                     |   14 +-
 test/function/type.wren                       |    8 +-
 test/grammar.wren                             |   20 +-
 test/if.wren                                  |   26 +-
 test/inheritance/inherit_fields.wren          |    8 +-
 test/inheritance/inherit_methods.wren         |   16 +-
 test/inheritance/inherit_static_methods.wren  |   16 +-
 test/inheritance/is.wren                      |   18 +-
 test/io/write.wren                            |    6 +-
 test/is.wren                                  |   48 +-
 test/limit/long_function.wren                 | 2000 ++++++++---------
 test/limit/long_string.wren                   |    2 +-
 test/limit/many_constants.wren                |    2 +-
 test/list/add.wren                            |    8 +-
 test/list/clear.wren                          |    6 +-
 test/list/count.wren                          |    6 +-
 test/list/insert.wren                         |   20 +-
 test/list/iterate.wren                        |   12 +-
 test/list/iterator_value.wren                 |    8 +-
 test/list/newlines.wren                       |    8 +-
 test/list/remove_at.wren                      |   14 +-
 test/list/subscript.wren                      |   16 +-
 test/list/subscript_setter.wren               |    6 +-
 test/list/to_string.wren                      |    8 +-
 test/list/type.wren                           |    8 +-
 test/method/arity.wren                        |   34 +-
 test/method/empty_block.wren                  |    2 +-
 test/method/long_name.wren                    |    2 +-
 test/method/many_methods.wren                 |    2 +-
 test/method/operators.wren                    |   26 +-
 test/method/static.wren                       |    8 +-
 test/method/too_many_arguments.wren           |    2 +-
 test/no_trailing_newline.wren                 |    2 +-
 test/null.wren                                |    2 +-
 test/null_type.wren                           |    8 +-
 test/number/abs.wren                          |   12 +-
 test/number/bitwise_not.wren                  |   28 +-
 test/number/comparison.wren                   |   40 +-
 test/number/divide.wren                       |    4 +-
 test/number/equality.wren                     |   28 +-
 test/number/literals.wren                     |   12 +-
 test/number/minus.wren                        |    8 +-
 test/number/mod.wren                          |   18 +-
 test/number/multiply.wren                     |    4 +-
 test/number/plus.wren                         |    6 +-
 test/number/range.wren                        |   12 +-
 test/number/to_string.wren                    |   10 +-
 test/number/type.wren                         |    8 +-
 test/object/to_string.wren                    |    2 +-
 test/or.wren                                  |   28 +-
 test/return/after_else.wren                   |    2 +-
 test/return/after_if.wren                     |    2 +-
 test/return/after_while.wren                  |    2 +-
 test/return/in_function.wren                  |    2 +-
 test/return/in_method.wren                    |    4 +-
 test/semicolon.wren                           |    2 +-
 test/setter/associativity.wren                |    6 +-
 test/setter/instance.wren                     |    2 +-
 test/setter/result.wren                       |    2 +-
 test/setter/same_name_as_method.wren          |    4 +-
 test/setter/static.wren                       |    2 +-
 test/string/contains.wren                     |   12 +-
 test/string/count.wren                        |    4 +-
 test/string/equality.wren                     |   28 +-
 test/string/escapes.wren                      |    7 +-
 test/string/literals.wren                     |    4 +-
 test/string/subscript.wren                    |   16 +-
 test/string/to_string.wren                    |    4 +-
 test/string/type.wren                         |    8 +-
 test/string/unicode_escapes.wren              |   18 +
 test/super/call_other_method.wren             |    4 +-
 test/super/call_same_method.wren              |    4 +-
 test/super/closure.wren                       |    2 +-
 test/super/indirectly_inherited.wren          |    4 +-
 test/this/closure.wren                        |    2 +-
 test/this/nested_class.wren                   |    6 +-
 test/this/nested_closure.wren                 |    2 +-
 test/this/this_in_method.wren                 |    2 +-
 test/unexpected_character.wren                |    2 +-
 test/variable/global_in_initializer.wren      |    2 +-
 test/variable/global_without_initializer.wren |    2 +-
 test/variable/local_in_initializer.wren       |    2 +-
 test/variable/local_in_middle_of_block.wren   |    8 +-
 test/variable/local_in_nested_block.wren      |    2 +-
 test/variable/local_without_initializer.wren  |    2 +-
 test/variable/many_locals.wren                |    2 +-
 .../variable/many_nonsimultaneous_locals.wren |    4 +-
 test/variable/scope_if.wren                   |    4 +-
 .../scope_reuse_in_different_blocks.wren      |    4 +-
 test/variable/scope_while.wren                |    2 +-
 test/variable/shadow_and_local.wren           |    4 +-
 test/variable/shadow_global.wren              |    4 +-
 test/variable/shadow_in_initializer.wren      |    2 +-
 test/variable/shadow_local.wren               |    4 +-
 test/variable/undefined_global.wren           |    2 +-
 test/variable/undefined_local.wren            |    2 +-
 test/while/closure_in_body.wren               |    2 +-
 test/while/syntax.wren                        |    6 +-
 159 files changed, 1690 insertions(+), 1599 deletions(-)
 create mode 100644 test/string/unicode_escapes.wren

diff --git a/benchmark/binary_trees.wren b/benchmark/binary_trees.wren
index 0057562a..9ad20af5 100644
--- a/benchmark/binary_trees.wren
+++ b/benchmark/binary_trees.wren
@@ -26,7 +26,7 @@ var stretchDepth = maxDepth + 1
 
 var start = OS.clock
 
-IO.write("stretch tree of depth " + stretchDepth.toString + " check: " +
+IO.print("stretch tree of depth " + stretchDepth.toString + " check: " +
     new Tree(0, stretchDepth).check.toString)
 
 var longLivedTree = new Tree(0, maxDepth)
@@ -46,13 +46,13 @@ while (depth < stretchDepth) {
     i = i + 1
   }
 
-  IO.write((iterations * 2).toString + " trees of depth " + depth.toString +
+  IO.print((iterations * 2).toString + " trees of depth " + depth.toString +
       " check: " + check.toString)
   iterations = iterations / 4
   depth = depth + 2
 }
 
-IO.write("long lived tree of depth " + maxDepth.toString + " check: " +
+IO.print("long lived tree of depth " + maxDepth.toString + " check: " +
     longLivedTree.check.toString)
 
-IO.write("elapsed: " + (OS.clock - start).toString)
+IO.print("elapsed: " + (OS.clock - start).toString)
diff --git a/benchmark/fib.wren b/benchmark/fib.wren
index 378cf79b..62e1c86d 100644
--- a/benchmark/fib.wren
+++ b/benchmark/fib.wren
@@ -8,6 +8,6 @@ var fib = fn(n) {
 
 var start = OS.clock
 for (i in 1..5) {
-  IO.write(fib.call(28))
+  IO.print(fib.call(28))
 }
-IO.write("elapsed: " + (OS.clock - start).toString)
+IO.print("elapsed: " + (OS.clock - start).toString)
diff --git a/benchmark/for.wren b/benchmark/for.wren
index ea1153f2..584b28f2 100644
--- a/benchmark/for.wren
+++ b/benchmark/for.wren
@@ -7,5 +7,5 @@ var sum = 0
 for (i in list) {
   sum = sum + i
 }
-IO.write(sum)
-IO.write("elapsed: " + (OS.clock - start).toString)
+IO.print(sum)
+IO.print("elapsed: " + (OS.clock - start).toString)
diff --git a/benchmark/method_call.wren b/benchmark/method_call.wren
index 6338818d..b686ba2a 100644
--- a/benchmark/method_call.wren
+++ b/benchmark/method_call.wren
@@ -46,7 +46,7 @@ for (i in 0...n) {
   val = toggle.activate.value
 }
 
-IO.write(toggle.value)
+IO.print(toggle.value)
 
 val = true
 var ntoggle = new NthToggle(val, 3)
@@ -64,6 +64,6 @@ for (i in 0...n) {
   val = ntoggle.activate.value
 }
 
-IO.write(ntoggle.value)
+IO.print(ntoggle.value)
 
-IO.write("elapsed: " + (OS.clock - start).toString)
+IO.print("elapsed: " + (OS.clock - start).toString)
diff --git a/corelib.wren b/corelib.wren
index 0f396eea..0fd4aca8 100644
--- a/corelib.wren
+++ b/corelib.wren
@@ -1,8 +1,14 @@
 // Note: This is converted to a C string literal and inserted into
 // src/wren_core.c using make_corelib.
 class IO {
+  static print(obj) {
+    IO.writeString_(obj.toString)
+    IO.writeString_("\n")
+    return obj
+  }
+
   static write(obj) {
-    IO.write__native__(obj.toString)
+    IO.writeString_(obj.toString)
     return obj
   }
 }
diff --git a/example/hello.wren b/example/hello.wren
index 06cb80a0..0bb440c3 100644
--- a/example/hello.wren
+++ b/example/hello.wren
@@ -1 +1 @@
-IO.write("Hello, world!")
+IO.print("Hello, world!")
diff --git a/src/wren_compiler.c b/src/wren_compiler.c
index 57a81ab6..3e42206a 100644
--- a/src/wren_compiler.c
+++ b/src/wren_compiler.c
@@ -514,10 +514,71 @@ static void readName(Parser* parser, TokenType type)
   makeToken(parser, type);
 }
 
-// Adds [c] to the current string literal being tokenized.
-static void addStringChar(Parser* parser, char c)
+// Adds [c] to the current string literal being tokenized. If [c] is outside of
+// ASCII range, it will emit the UTF-8 encoded byte sequence for it.
+static void addStringChar(Parser* parser, uint32_t c)
 {
-  wrenByteBufferWrite(parser->vm, &parser->string, c);
+  ByteBuffer* buffer = &parser->string;
+
+  if (c <= 0x7f)
+  {
+    // Single byte (i.e. fits in ASCII).
+    wrenByteBufferWrite(parser->vm, buffer, c);
+  }
+  else if (c <= 0x7ff)
+  {
+    // Two byte sequence: 110xxxxx	 10xxxxxx.
+    wrenByteBufferWrite(parser->vm, buffer, 0xc0 | ((c & 0x7c0) >> 6));
+    wrenByteBufferWrite(parser->vm, buffer, 0x80 | (c & 0x3f));
+  }
+  else if (c <= 0xffff)
+  {
+    // Three byte sequence: 1110xxxx	 10xxxxxx 10xxxxxx.
+    wrenByteBufferWrite(parser->vm, buffer, 0xe0 | ((c & 0xf000) >> 12));
+    wrenByteBufferWrite(parser->vm, buffer, 0x80 | ((c & 0xfc0) >> 6));
+    wrenByteBufferWrite(parser->vm, buffer, 0x80 | (c & 0x3f));
+  }
+  else if (c <= 0x10ffff)
+  {
+    // Four byte sequence: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx.
+    wrenByteBufferWrite(parser->vm, buffer, 0xf0 | ((c & 0x1c0000) >> 18));
+    wrenByteBufferWrite(parser->vm, buffer, 0x80 | ((c & 0x3f000) >> 12));
+    wrenByteBufferWrite(parser->vm, buffer, 0x80 | ((c & 0xfc0) >> 6));
+    wrenByteBufferWrite(parser->vm, buffer, 0x80 | (c & 0x3f));
+  }
+  else
+  {
+    // Invalid Unicode value. See: http://tools.ietf.org/html/rfc3629
+    // TODO: Error.
+  }
+}
+
+// Reads the next character, which should be a hex digit (0-9, a-f, or A-F) and
+// returns its numeric value. If the character isn't a hex digit, returns -1.
+static int readHexDigit(Parser* parser)
+{
+  char c = nextChar(parser);
+  if (c >= '0' && c <= '9') return c - '0';
+  if (c >= 'a' && c <= 'f') return c - 'a' + 10;
+  if (c >= 'A' && c <= 'F') return c - 'A' + 10;
+  return -1;
+}
+
+// Reads a four hex digit Unicode escape sequence in a string literal.
+static void readUnicodeEscape(Parser* parser)
+{
+  int value = 0;
+  for (int i = 0; i < 4; i++)
+  {
+    char digit = readHexDigit(parser);
+    // TODO: Signal error.
+    if (digit == -1) return;
+
+    value = (value * 16) | digit;
+  }
+
+  // TODO: Handle encoding!
+  addStringChar(parser, value);
 }
 
 // Finishes lexing a string literal.
@@ -538,6 +599,7 @@ static void readString(Parser* parser)
         case '\\': addStringChar(parser, '\\'); break;
         case 'n':  addStringChar(parser, '\n'); break;
         case 't':  addStringChar(parser, '\t'); break;
+        case 'u':  readUnicodeEscape(parser); break;
         default:
           // TODO: Emit error token.
           break;
diff --git a/src/wren_core.c b/src/wren_core.c
index 6cb43155..dbb80fbd 100644
--- a/src/wren_core.c
+++ b/src/wren_core.c
@@ -43,8 +43,14 @@
 // make_corelib. Do not edit here.
 const char* coreLibSource =
 "class IO {\n"
+"  static print(obj) {\n"
+"    IO.writeString_(obj.toString)\n"
+"    IO.writeString_(\"\n\")\n"
+"    return obj\n"
+"  }\n"
+"\n"
 "  static write(obj) {\n"
-"    IO.write__native__(obj.toString)\n"
+"    IO.writeString_(obj.toString)\n"
 "    return obj\n"
 "  }\n"
 "}\n"
@@ -471,9 +477,9 @@ DEF_NATIVE(string_subscript)
 
 DEF_NATIVE(io_writeString)
 {
+  if (!validateString(vm, args, 1, "Argument")) return PRIM_ERROR;
   wrenPrintValue(args[1]);
-  printf("\n");
-  RETURN_VAL(args[1]);
+  RETURN_NULL;
 }
 
 DEF_NATIVE(os_clock)
@@ -621,5 +627,5 @@ void wrenInitializeCore(WrenVM* vm)
   NATIVE(vm->numClass, "!= ", num_bangeq);
 
   ObjClass* ioClass = AS_CLASS(findGlobal(vm, "IO"));
-  NATIVE(ioClass->metaclass, "write__native__ ", io_writeString);
+  NATIVE(ioClass->metaclass, "writeString_ ", io_writeString);
 }
diff --git a/test/and.wren b/test/and.wren
index c2c0de1a..d05d0561 100644
--- a/test/and.wren
+++ b/test/and.wren
@@ -1,26 +1,26 @@
 // Note: These tests implicitly depend on ints being truthy.
-//       Also rely on IO.write() returning its argument.
+//       Also rely on IO.print() returning its argument.
 
 // Return the first non-true argument.
-IO.write(false && 1) // expect: false
-IO.write(true && 1) // expect: 1
-IO.write(1 && 2 && false) // expect: false
+IO.print(false && 1) // expect: false
+IO.print(true && 1) // expect: 1
+IO.print(1 && 2 && false) // expect: false
 
 // Return the last argument if all are true.
-IO.write(1 && true) // expect: true
-IO.write(1 && 2 && 3) // expect: 3
+IO.print(1 && true) // expect: true
+IO.print(1 && 2 && 3) // expect: 3
 
 // Short-circuit at the first false argument.
-IO.write(true) && // expect: true
-    IO.write(false) && // expect: false
-    IO.write(false) // should not print
+IO.print(true) && // expect: true
+    IO.print(false) && // expect: false
+    IO.print(false) // should not print
 
 // Swallow a trailing newline.
-IO.write(true &&
+IO.print(true &&
     true) // expect: true
 
 // Only false is falsy.
-IO.write(0 && true) // expect: true
-IO.write(null && true) // expect: true
-IO.write("" && true) // expect: true
-IO.write(false && true) // expect: false
+IO.print(0 && true) // expect: true
+IO.print(null && true) // expect: true
+IO.print("" && true) // expect: true
+IO.print(false && true) // expect: false
diff --git a/test/assignment/associativity.wren b/test/assignment/associativity.wren
index 2fb8ea5f..e7844499 100644
--- a/test/assignment/associativity.wren
+++ b/test/assignment/associativity.wren
@@ -4,6 +4,6 @@ var c = "c"
 
 // Assignment is right-associative.
 a = b = c
-IO.write(a) // expect: c
-IO.write(b) // expect: c
-IO.write(c) // expect: c
+IO.print(a) // expect: c
+IO.print(b) // expect: c
+IO.print(c) // expect: c
diff --git a/test/assignment/global.wren b/test/assignment/global.wren
index 806cf9ca..fa070409 100644
--- a/test/assignment/global.wren
+++ b/test/assignment/global.wren
@@ -1,8 +1,8 @@
 var a = "before"
-IO.write(a) // expect: before
+IO.print(a) // expect: before
 
 a = "after"
-IO.write(a) // expect: after
+IO.print(a) // expect: after
 
-IO.write(a = "arg") // expect: arg
-IO.write(a) // expect: arg
+IO.print(a = "arg") // expect: arg
+IO.print(a) // expect: arg
diff --git a/test/assignment/local.wren b/test/assignment/local.wren
index cc29c424..e71383e5 100644
--- a/test/assignment/local.wren
+++ b/test/assignment/local.wren
@@ -1,10 +1,10 @@
 fn {
   var a = "before"
-  IO.write(a) // expect: before
+  IO.print(a) // expect: before
 
   a = "after"
-  IO.write(a) // expect: after
+  IO.print(a) // expect: after
 
-  IO.write(a = "arg") // expect: arg
-  IO.write(a) // expect: arg
+  IO.print(a = "arg") // expect: arg
+  IO.print(a) // expect: arg
 }.call
diff --git a/test/assignment/syntax.wren b/test/assignment/syntax.wren
index 7fc91a8d..f283a5bd 100644
--- a/test/assignment/syntax.wren
+++ b/test/assignment/syntax.wren
@@ -2,10 +2,10 @@
 var a = "a"
 var b = "b"
 a = b = "chain"
-IO.write(a) // expect: chain
-IO.write(a) // expect: chain
+IO.print(a) // expect: chain
+IO.print(a) // expect: chain
 
 // Assignment on RHS of variable.
 var c = a = "var"
-IO.write(a) // expect: var
-IO.write(c) // expect: var
+IO.print(a) // expect: var
+IO.print(c) // expect: var
diff --git a/test/bool/equality.wren b/test/bool/equality.wren
index 9e61f63a..6797482a 100644
--- a/test/bool/equality.wren
+++ b/test/bool/equality.wren
@@ -1,23 +1,23 @@
-IO.write(true == true)    // expect: true
-IO.write(true == false)   // expect: false
-IO.write(false == true)   // expect: false
-IO.write(false == false)  // expect: true
+IO.print(true == true)    // expect: true
+IO.print(true == false)   // expect: false
+IO.print(false == true)   // expect: false
+IO.print(false == false)  // expect: true
 
 // Not equal to other types.
-IO.write(true == 1)        // expect: false
-IO.write(false == 0)       // expect: false
-IO.write(true == "true")   // expect: false
-IO.write(false == "false") // expect: false
-IO.write(false == "")      // expect: false
+IO.print(true == 1)        // expect: false
+IO.print(false == 0)       // expect: false
+IO.print(true == "true")   // expect: false
+IO.print(false == "false") // expect: false
+IO.print(false == "")      // expect: false
 
-IO.write(true != true)    // expect: false
-IO.write(true != false)   // expect: true
-IO.write(false != true)   // expect: true
-IO.write(false != false)  // expect: false
+IO.print(true != true)    // expect: false
+IO.print(true != false)   // expect: true
+IO.print(false != true)   // expect: true
+IO.print(false != false)  // expect: false
 
 // Not equal to other types.
-IO.write(true != 1)        // expect: true
-IO.write(false != 0)       // expect: true
-IO.write(true != "true")   // expect: true
-IO.write(false != "false") // expect: true
-IO.write(false != "")      // expect: true
+IO.print(true != 1)        // expect: true
+IO.print(false != 0)       // expect: true
+IO.print(true != "true")   // expect: true
+IO.print(false != "false") // expect: true
+IO.print(false != "")      // expect: true
diff --git a/test/bool/not.wren b/test/bool/not.wren
index 55510225..cc8b7558 100644
--- a/test/bool/not.wren
+++ b/test/bool/not.wren
@@ -1,3 +1,3 @@
-IO.write(!true)    // expect: false
-IO.write(!false)   // expect: true
-IO.write(!!true)   // expect: true
+IO.print(!true)    // expect: false
+IO.print(!false)   // expect: true
+IO.print(!!true)   // expect: true
diff --git a/test/bool/to_string.wren b/test/bool/to_string.wren
index 0f3322d2..e23c13c6 100644
--- a/test/bool/to_string.wren
+++ b/test/bool/to_string.wren
@@ -1,2 +1,2 @@
-IO.write(true.toString)  // expect: true
-IO.write(false.toString) // expect: false
+IO.print(true.toString)  // expect: true
+IO.print(false.toString) // expect: false
diff --git a/test/bool/type.wren b/test/bool/type.wren
index 52e0d3a5..242b7871 100644
--- a/test/bool/type.wren
+++ b/test/bool/type.wren
@@ -1,4 +1,4 @@
-IO.write(true is Bool)      // expect: true
-IO.write(true is Object)    // expect: true
-IO.write(true is Num)       // expect: false
-IO.write(true.type == Bool) // expect: true
+IO.print(true is Bool)      // expect: true
+IO.print(true is Object)    // expect: true
+IO.print(true is Num)       // expect: false
+IO.print(true.type == Bool) // expect: true
diff --git a/test/break/in_for_loop.wren b/test/break/in_for_loop.wren
index df89195a..67479f33 100644
--- a/test/break/in_for_loop.wren
+++ b/test/break/in_for_loop.wren
@@ -1,7 +1,7 @@
 for (i in [1, 2, 3, 4, 5]) {
-  IO.write(i)
+  IO.print(i)
   if (i > 2) break
-  IO.write(i)
+  IO.print(i)
 }
 // expect: 1
 // expect: 1
diff --git a/test/break/in_while_loop.wren b/test/break/in_while_loop.wren
index 2e0e9cf7..9ef4fb5f 100644
--- a/test/break/in_while_loop.wren
+++ b/test/break/in_while_loop.wren
@@ -1,9 +1,9 @@
 var i = 0
 while (true) {
   i = i + 1
-  IO.write(i)
+  IO.print(i)
   if (i > 2) break
-  IO.write(i)
+  IO.print(i)
 }
 // expect: 1
 // expect: 1
diff --git a/test/break/nested_loop.wren b/test/break/nested_loop.wren
index be4cb39e..62784ba0 100644
--- a/test/break/nested_loop.wren
+++ b/test/break/nested_loop.wren
@@ -1,11 +1,11 @@
 var i = 0
 while (true) {
-  IO.write("outer " + i.toString)
+  IO.print("outer " + i.toString)
   if (i > 1) break
 
   var j = 0
   while (true) {
-    IO.write("inner " + j.toString)
+    IO.print("inner " + j.toString)
     if (j > 1) break
 
     j = j + 1
diff --git a/test/class/equality.wren b/test/class/equality.wren
index 8f6bfb2b..51dce1a7 100644
--- a/test/class/equality.wren
+++ b/test/class/equality.wren
@@ -1,13 +1,13 @@
-IO.write(Num == Num)  // expect: true
-IO.write(Num == Bool) // expect: false
+IO.print(Num == Num)  // expect: true
+IO.print(Num == Bool) // expect: false
 
 // Not equal to other types.
-IO.write(Num == 123)  // expect: false
-IO.write(Num == true) // expect: false
+IO.print(Num == 123)  // expect: false
+IO.print(Num == true) // expect: false
 
-IO.write(Num != Num)  // expect: false
-IO.write(Num != Bool) // expect: true
+IO.print(Num != Num)  // expect: false
+IO.print(Num != Bool) // expect: true
 
 // Not equal to other types.
-IO.write(Num != 123)  // expect: true
-IO.write(Num != true) // expect: true
+IO.print(Num != 123)  // expect: true
+IO.print(Num != true) // expect: true
diff --git a/test/class/name_inside_body.wren b/test/class/name_inside_body.wren
index 5fb7ed58..4f8656ea 100644
--- a/test/class/name_inside_body.wren
+++ b/test/class/name_inside_body.wren
@@ -1,10 +1,10 @@
 class Foo {
   static sayName {
-    IO.write(Foo.toString)
+    IO.print(Foo.toString)
   }
 
   sayName {
-    IO.write(Foo.toString)
+    IO.print(Foo.toString)
   }
 
   static toString { return "Foo!" }
diff --git a/test/class/new.wren b/test/class/new.wren
index 9483ee27..c99e5e07 100644
--- a/test/class/new.wren
+++ b/test/class/new.wren
@@ -1,6 +1,6 @@
 class Foo {}
 
 var foo = new Foo
-IO.write(foo is Foo) // expect: true
+IO.print(foo is Foo) // expect: true
 
 // TODO: Test precedence and grammar of what follows "new".
diff --git a/test/class/type.wren b/test/class/type.wren
index dea1ff0b..24239fcc 100644
--- a/test/class/type.wren
+++ b/test/class/type.wren
@@ -1,10 +1,10 @@
 class Foo {}
 
 // A class is a class.
-IO.write(Foo is Class) // expect: true
+IO.print(Foo is Class) // expect: true
 
 // It's metatype is also a class.
-IO.write(Foo.type is Class) // expect: true
+IO.print(Foo.type is Class) // expect: true
 
 // The metatype's metatype is Class.
-IO.write(Foo.type.type == Class) // expect: true
+IO.print(Foo.type.type == Class) // expect: true
diff --git a/test/closure/assign_to_closure.wren b/test/closure/assign_to_closure.wren
index 511699a0..13c76ddb 100644
--- a/test/closure/assign_to_closure.wren
+++ b/test/closure/assign_to_closure.wren
@@ -4,15 +4,15 @@ var g = null
 {
   var local = "local"
   f = fn {
-    IO.write(local)
+    IO.print(local)
     local = "after f"
-    IO.write(local)
+    IO.print(local)
   }
 
   g = fn {
-    IO.write(local)
+    IO.print(local)
     local = "after g"
-    IO.write(local)
+    IO.print(local)
   }
 }
 
diff --git a/test/closure/close_over_function_parameter.wren b/test/closure/close_over_function_parameter.wren
index f8495944..3821059c 100644
--- a/test/closure/close_over_function_parameter.wren
+++ b/test/closure/close_over_function_parameter.wren
@@ -2,7 +2,7 @@ var f = null
 
 fn(param) {
   f = fn {
-    IO.write(param)
+    IO.print(param)
   }
 }.call("param")
 
diff --git a/test/closure/close_over_method_parameter.wren b/test/closure/close_over_method_parameter.wren
index d3181a48..7dc87a3c 100644
--- a/test/closure/close_over_method_parameter.wren
+++ b/test/closure/close_over_method_parameter.wren
@@ -3,7 +3,7 @@ var f = null
 class Foo {
   method(param) {
     f = fn {
-      IO.write(param)
+      IO.print(param)
     }
   }
 }
diff --git a/test/closure/closed_closure_in_function.wren b/test/closure/closed_closure_in_function.wren
index df26eccc..474fc65f 100644
--- a/test/closure/closed_closure_in_function.wren
+++ b/test/closure/closed_closure_in_function.wren
@@ -3,7 +3,7 @@ var f = null
 {
   var local = "local"
   f = fn {
-    IO.write(local)
+    IO.print(local)
   }
 }
 
diff --git a/test/closure/closed_closure_in_method.wren b/test/closure/closed_closure_in_method.wren
index 8dc3c842..3025841e 100644
--- a/test/closure/closed_closure_in_method.wren
+++ b/test/closure/closed_closure_in_method.wren
@@ -4,7 +4,7 @@ var foo = null
   var local = "local"
   class Foo {
     method {
-      IO.write(local)
+      IO.print(local)
     }
   }
 
diff --git a/test/closure/nested_closure.wren b/test/closure/nested_closure.wren
index ebf92d06..6fb1ca46 100644
--- a/test/closure/nested_closure.wren
+++ b/test/closure/nested_closure.wren
@@ -7,9 +7,9 @@ fn {
     fn {
       var c = "c"
       f = fn {
-        IO.write(a)
-        IO.write(b)
-        IO.write(c)
+        IO.print(a)
+        IO.print(b)
+        IO.print(c)
       }
     }.call
   }.call
diff --git a/test/closure/open_closure_in_function.wren b/test/closure/open_closure_in_function.wren
index 9aeff842..9fc233d1 100644
--- a/test/closure/open_closure_in_function.wren
+++ b/test/closure/open_closure_in_function.wren
@@ -1,6 +1,6 @@
 {
   var local = "local"
   fn {
-    IO.write(local) // expect: local
+    IO.print(local) // expect: local
   }.call
 }
diff --git a/test/closure/open_closure_in_method.wren b/test/closure/open_closure_in_method.wren
index 97badc24..bd1d1e52 100644
--- a/test/closure/open_closure_in_method.wren
+++ b/test/closure/open_closure_in_method.wren
@@ -2,7 +2,7 @@
   var local = "local"
   class Foo {
     method {
-      IO.write(local)
+      IO.print(local)
     }
   }
 
diff --git a/test/closure/reference_closure_multiple_times.wren b/test/closure/reference_closure_multiple_times.wren
index bad90186..fdf5d873 100644
--- a/test/closure/reference_closure_multiple_times.wren
+++ b/test/closure/reference_closure_multiple_times.wren
@@ -3,8 +3,8 @@ var f = null
 {
   var a = "a"
   f = fn {
-    IO.write(a)
-    IO.write(a)
+    IO.print(a)
+    IO.print(a)
   }
 }
 
diff --git a/test/closure/reuse_closure_slot.wren b/test/closure/reuse_closure_slot.wren
index 8aa223d1..1685b36a 100644
--- a/test/closure/reuse_closure_slot.wren
+++ b/test/closure/reuse_closure_slot.wren
@@ -3,7 +3,7 @@
 
   {
     var a = "a"
-    f = fn IO.write(a)
+    f = fn IO.print(a)
   }
 
   {
diff --git a/test/closure/use_global_in_function.wren b/test/closure/use_global_in_function.wren
index 910e9a72..aaa50240 100644
--- a/test/closure/use_global_in_function.wren
+++ b/test/closure/use_global_in_function.wren
@@ -2,5 +2,5 @@ var global = "global"
 // TODO: Forward reference to global declared after use.
 
 fn {
-  IO.write(global) // expect: global
+  IO.print(global) // expect: global
 }.call
diff --git a/test/closure/use_global_in_method.wren b/test/closure/use_global_in_method.wren
index 38b9f6db..e61770ba 100644
--- a/test/closure/use_global_in_method.wren
+++ b/test/closure/use_global_in_method.wren
@@ -3,11 +3,11 @@ var global = "global"
 
 class Foo {
   method {
-    IO.write(global)
+    IO.print(global)
   }
 
   static classMethod {
-    IO.write(global)
+    IO.print(global)
   }
 }
 
diff --git a/test/comments/block.wren b/test/comments/block.wren
index 626a4b4a..bf7d5b81 100644
--- a/test/comments/block.wren
+++ b/test/comments/block.wren
@@ -1,5 +1,5 @@
 // In middle of line.
-IO.write/* ... */(/* */"ok"/* */) // expect: ok
+IO.print/* ... */(/* */"ok"/* */) // expect: ok
 
 // Nested.
-IO.write(/* in /* nest */ out */"ok") // expect: ok
+IO.print(/* in /* nest */ out */"ok") // expect: ok
diff --git a/test/comments/block_at_eof.wren b/test/comments/block_at_eof.wren
index cbc935f1..a7e1bf7a 100644
--- a/test/comments/block_at_eof.wren
+++ b/test/comments/block_at_eof.wren
@@ -1,2 +1,2 @@
-IO.write("ok") // expect: ok
+IO.print("ok") // expect: ok
 /* comment */
\ No newline at end of file
diff --git a/test/comments/line_at_eof.wren b/test/comments/line_at_eof.wren
index e44ed826..f450eab8 100644
--- a/test/comments/line_at_eof.wren
+++ b/test/comments/line_at_eof.wren
@@ -1,2 +1,2 @@
-IO.write("ok") // expect: ok
+IO.print("ok") // expect: ok
 // comment
\ No newline at end of file
diff --git a/test/comments/unicode.wren b/test/comments/unicode.wren
index 233dd695..06e65898 100644
--- a/test/comments/unicode.wren
+++ b/test/comments/unicode.wren
@@ -8,4 +8,4 @@
 
 // TODO: What about combining characters?
 
-IO.write("ok") // expect: ok
+IO.print("ok") // expect: ok
diff --git a/test/comments/unterminated_block.wren b/test/comments/unterminated_block.wren
index 18d6c474..1c39563d 100644
--- a/test/comments/unterminated_block.wren
+++ b/test/comments/unterminated_block.wren
@@ -1,3 +1,3 @@
 // expect error line 3
-IO.write("nope") /*
+IO.print("nope") /*
 oops
\ No newline at end of file
diff --git a/test/comments/unterminated_nested_block.wren b/test/comments/unterminated_nested_block.wren
index 2c196fa1..0afe4ff1 100644
--- a/test/comments/unterminated_nested_block.wren
+++ b/test/comments/unterminated_nested_block.wren
@@ -1,4 +1,4 @@
 // expect error line 4
-IO.write("nope") /* /* /*
+IO.print("nope") /* /* /*
 */
 oops
\ No newline at end of file
diff --git a/test/constructor/default.wren b/test/constructor/default.wren
index a9e4f996..a8b8085f 100644
--- a/test/constructor/default.wren
+++ b/test/constructor/default.wren
@@ -4,5 +4,5 @@ class Foo {
 
 // Classes inherit the argument-less "new" one by default.
 var foo = new Foo
-IO.write(foo is Foo) // expect: true
-IO.write(foo.toString) // expect: Foo
+IO.print(foo is Foo) // expect: true
+IO.print(foo.toString) // expect: Foo
diff --git a/test/constructor/infix_class_expression.wren b/test/constructor/infix_class_expression.wren
index 876b9436..a0d9ef36 100644
--- a/test/constructor/infix_class_expression.wren
+++ b/test/constructor/infix_class_expression.wren
@@ -2,6 +2,6 @@ class Foo {
   + other { return "Foo " + other }
 }
 
-IO.write(new Foo + "value") // expect: Foo value
+IO.print(new Foo + "value") // expect: Foo value
 
 // TODO: Other expressions following a constructor, like new Foo.bar("arg").
diff --git a/test/constructor/new.wren b/test/constructor/new.wren
index 01eb61cd..9539ea67 100644
--- a/test/constructor/new.wren
+++ b/test/constructor/new.wren
@@ -1,7 +1,7 @@
 class Foo {
-  new { IO.write("zero") }
-  new(a) { IO.write(a) }
-  new(a, b) { IO.write(a + b) }
+  new { IO.print("zero") }
+  new(a) { IO.print(a) }
+  new(a, b) { IO.print(a + b) }
 
   toString { return "Foo" }
 }
@@ -13,5 +13,5 @@ new Foo("one", "two") // expect: onetwo
 
 // Returns the new instance.
 var foo = new Foo // expect: zero
-IO.write(foo is Foo) // expect: true
-IO.write(foo.toString) // expect: Foo
+IO.print(foo is Foo) // expect: true
+IO.print(foo.toString) // expect: Foo
diff --git a/test/constructor/superclass.wren b/test/constructor/superclass.wren
index e0e16dd4..5f7c2871 100644
--- a/test/constructor/superclass.wren
+++ b/test/constructor/superclass.wren
@@ -1,6 +1,6 @@
 class A {
   new(arg) {
-    IO.write("new A " + arg)
+    IO.print("new A " + arg)
     _field = arg
   }
 
@@ -10,7 +10,7 @@ class A {
 class B is A {
   new(arg1, arg2) {
     super(arg2)
-    IO.write("new B " + arg1)
+    IO.print("new B " + arg1)
     _field = arg1
   }
 
@@ -20,7 +20,7 @@ class B is A {
 class C is B {
   new {
     super("one", "two")
-    IO.write("new C")
+    IO.print("new C")
     _field = "c"
   }
 
@@ -31,10 +31,10 @@ var c = new C
 // expect: new A two
 // expect: new B one
 // expect: new C
-IO.write(c is A) // expect: true
-IO.write(c is B) // expect: true
-IO.write(c is C) // expect: true
+IO.print(c is A) // expect: true
+IO.print(c is B) // expect: true
+IO.print(c is C) // expect: true
 
-IO.write(c.aField) // expect: two
-IO.write(c.bField) // expect: one
-IO.write(c.cField) // expect: c
+IO.print(c.aField) // expect: two
+IO.print(c.bField) // expect: one
+IO.print(c.cField) // expect: c
diff --git a/test/empty_block.wren b/test/empty_block.wren
index 71591ff7..cfe778ac 100644
--- a/test/empty_block.wren
+++ b/test/empty_block.wren
@@ -4,4 +4,4 @@
 if (true) {}
 if (false) {} else {}
 
-IO.write("ok") // expect: ok
\ No newline at end of file
+IO.print("ok") // expect: ok
\ No newline at end of file
diff --git a/test/field/closure.wren b/test/field/closure.wren
index cba651e5..782805cf 100644
--- a/test/field/closure.wren
+++ b/test/field/closure.wren
@@ -11,6 +11,6 @@ class Foo {
 }
 
 var foo = new Foo
-IO.write(foo.closeOverGet.call) // expect: Foo field
+IO.print(foo.closeOverGet.call) // expect: Foo field
 foo.closeOverSet.call
-IO.write(foo.closeOverGet.call) // expect: new value
+IO.print(foo.closeOverGet.call) // expect: new value
diff --git a/test/field/default_to_null.wren b/test/field/default_to_null.wren
index 9cc13e7f..aeba18d1 100644
--- a/test/field/default_to_null.wren
+++ b/test/field/default_to_null.wren
@@ -1,5 +1,5 @@
 class Foo {
-  write { IO.write(_field) }
+  write { IO.print(_field) }
 }
 
 (new Foo).write // expect: null
diff --git a/test/field/multiple.wren b/test/field/multiple.wren
index dfa740e5..879993d9 100644
--- a/test/field/multiple.wren
+++ b/test/field/multiple.wren
@@ -8,11 +8,11 @@ class Foo {
   }
 
   write {
-    IO.write(_a)
-    IO.write(_b)
-    IO.write(_c)
-    IO.write(_d)
-    IO.write(_e)
+    IO.print(_a)
+    IO.print(_b)
+    IO.print(_c)
+    IO.print(_d)
+    IO.print(_e)
   }
 }
 
diff --git a/test/field/nested_class.wren b/test/field/nested_class.wren
index 4ecc2523..85153bdf 100644
--- a/test/field/nested_class.wren
+++ b/test/field/nested_class.wren
@@ -1,17 +1,17 @@
 class Outer {
   method {
     _field = "outer"
-    IO.write(_field) // expect: outer
+    IO.print(_field) // expect: outer
 
     class Inner {
       method {
         _field = "inner"
-        IO.write(_field) // expect: inner
+        IO.print(_field) // expect: inner
       }
     }
 
     (new Inner).method
-    IO.write(_field) // expect: outer
+    IO.print(_field) // expect: outer
   }
 }
 
diff --git a/test/field/object_reference.wren b/test/field/object_reference.wren
index 5c834561..2a201dad 100644
--- a/test/field/object_reference.wren
+++ b/test/field/object_reference.wren
@@ -11,7 +11,7 @@ class Node {
       _left.write
     }
 
-    IO.write(_value)
+    IO.print(_value)
 
     if (_right is Node) {
       _right.write
diff --git a/test/field/use_before_set.wren b/test/field/use_before_set.wren
index 3c453799..6674547c 100644
--- a/test/field/use_before_set.wren
+++ b/test/field/use_before_set.wren
@@ -1,5 +1,5 @@
 class Foo {
-  write { IO.write(_field) } // Compile a use of the field...
+  write { IO.print(_field) } // Compile a use of the field...
   init { _field = "value" }  // ...before an assignment to it.
 }
 
diff --git a/test/for.wren b/test/for.wren
index af0278f8..6e7ed2bf 100644
--- a/test/for.wren
+++ b/test/for.wren
@@ -1,12 +1,12 @@
 // Single-expression body.
-for (i in [1, 2, 3]) IO.write(i)
+for (i in [1, 2, 3]) IO.print(i)
 // expect: 1
 // expect: 2
 // expect: 3
 
 // Block body.
 for (i in [1, 2, 3]) {
-  IO.write(i)
+  IO.print(i)
 }
 // expect: 1
 // expect: 2
@@ -14,7 +14,7 @@ for (i in [1, 2, 3]) {
 
 // Newline after "for".
 for
-(i in [1, 2, 3]) IO.write(i)
+(i in [1, 2, 3]) IO.print(i)
 // expect: 1
 // expect: 2
 // expect: 3
diff --git a/test/for/close_over_loop_variable.wren b/test/for/close_over_loop_variable.wren
index f3a3a975..a3b2a503 100644
--- a/test/for/close_over_loop_variable.wren
+++ b/test/for/close_over_loop_variable.wren
@@ -1,8 +1,8 @@
 var list = []
 
 for (i in [1, 2, 3]) {
-  list.add(fn IO.write(i))
-  //list.add(fn IO.write(i))
+  list.add(fn IO.print(i))
+  //list.add(fn IO.print(i))
 }
 
 for (f in list) f.call
diff --git a/test/for/closure_in_body.wren b/test/for/closure_in_body.wren
index c0d5af94..3070a5fb 100644
--- a/test/for/closure_in_body.wren
+++ b/test/for/closure_in_body.wren
@@ -2,7 +2,7 @@ var list = []
 
 for (i in [1, 2, 3]) {
   var j = i + 1
-  list.add(fn IO.write(j))
+  list.add(fn IO.print(j))
 }
 
 for (f in list) f.call
diff --git a/test/for/for_in_syntax.wren b/test/for/for_in_syntax.wren
index af0278f8..6e7ed2bf 100644
--- a/test/for/for_in_syntax.wren
+++ b/test/for/for_in_syntax.wren
@@ -1,12 +1,12 @@
 // Single-expression body.
-for (i in [1, 2, 3]) IO.write(i)
+for (i in [1, 2, 3]) IO.print(i)
 // expect: 1
 // expect: 2
 // expect: 3
 
 // Block body.
 for (i in [1, 2, 3]) {
-  IO.write(i)
+  IO.print(i)
 }
 // expect: 1
 // expect: 2
@@ -14,7 +14,7 @@ for (i in [1, 2, 3]) {
 
 // Newline after "for".
 for
-(i in [1, 2, 3]) IO.write(i)
+(i in [1, 2, 3]) IO.print(i)
 // expect: 1
 // expect: 2
 // expect: 3
diff --git a/test/for/only_evaluate_sequence_once.wren b/test/for/only_evaluate_sequence_once.wren
index d7ddadcb..931a2aca 100644
--- a/test/for/only_evaluate_sequence_once.wren
+++ b/test/for/only_evaluate_sequence_once.wren
@@ -1,9 +1,9 @@
 var f = fn {
-  IO.write("evaluate sequence")
+  IO.print("evaluate sequence")
   return [1, 2, 3]
 }
 
-for (i in f.call) IO.write(i)
+for (i in f.call) IO.print(i)
 // expect: evaluate sequence
 // expect: 1
 // expect: 2
diff --git a/test/function/empty_block.wren b/test/function/empty_block.wren
index 632e7ba2..840daa2e 100644
--- a/test/function/empty_block.wren
+++ b/test/function/empty_block.wren
@@ -1,2 +1,2 @@
 var f = fn {}
-IO.write(f.call) // expect: null
+IO.print(f.call) // expect: null
diff --git a/test/function/equality.wren b/test/function/equality.wren
index f6b75647..9de8548a 100644
--- a/test/function/equality.wren
+++ b/test/function/equality.wren
@@ -1,16 +1,16 @@
 // Not structurally equal.
-IO.write((fn 123) == (fn 123))  // expect: false
-IO.write((fn 123) != (fn 123))  // expect: true
+IO.print((fn 123) == (fn 123))  // expect: false
+IO.print((fn 123) != (fn 123))  // expect: true
 
 // Not equal to other types.
-IO.write((fn 123) == 1)         // expect: false
-IO.write((fn 123) == false)     // expect: false
-IO.write((fn 123) == "fn 123")  // expect: false
-IO.write((fn 123) != 1)         // expect: true
-IO.write((fn 123) != false)     // expect: true
-IO.write((fn 123) != "fn 123")  // expect: true
+IO.print((fn 123) == 1)         // expect: false
+IO.print((fn 123) == false)     // expect: false
+IO.print((fn 123) == "fn 123")  // expect: false
+IO.print((fn 123) != 1)         // expect: true
+IO.print((fn 123) != false)     // expect: true
+IO.print((fn 123) != "fn 123")  // expect: true
 
 // Equal by identity.
 var f = fn 123
-IO.write(f == f) // expect: true
-IO.write(f != f) // expect: false
+IO.print(f == f) // expect: true
+IO.print(f != f) // expect: false
diff --git a/test/function/parameters.wren b/test/function/parameters.wren
index e12d08ee..e88b98b0 100644
--- a/test/function/parameters.wren
+++ b/test/function/parameters.wren
@@ -1,50 +1,50 @@
 var f0 = fn 0
-IO.write(f0.call) // expect: 0
+IO.print(f0.call) // expect: 0
 
 var f1 = fn(a) a
-IO.write(f1.call(1)) // expect: 1
+IO.print(f1.call(1)) // expect: 1
 
 var f2 = fn(a, b) a + b
-IO.write(f2.call(1, 2)) // expect: 3
+IO.print(f2.call(1, 2)) // expect: 3
 
 var f3 = fn(a, b, c) a + b + c
-IO.write(f3.call(1, 2, 3)) // expect: 6
+IO.print(f3.call(1, 2, 3)) // expect: 6
 
 var f4 = fn(a, b, c, d) a + b + c + d
-IO.write(f4.call(1, 2, 3, 4)) // expect: 10
+IO.print(f4.call(1, 2, 3, 4)) // expect: 10
 
 var f5 = fn(a, b, c, d, e) a + b + c + d + e
-IO.write(f5.call(1, 2, 3, 4, 5)) // expect: 15
+IO.print(f5.call(1, 2, 3, 4, 5)) // expect: 15
 
 var f6 = fn(a, b, c, d, e, f) a + b + c + d + e + f
-IO.write(f6.call(1, 2, 3, 4, 5, 6)) // expect: 21
+IO.print(f6.call(1, 2, 3, 4, 5, 6)) // expect: 21
 
 var f7 = fn(a, b, c, d, e, f, g) a + b + c + d + e + f + g
-IO.write(f7.call(1, 2, 3, 4, 5, 6, 7)) // expect: 28
+IO.print(f7.call(1, 2, 3, 4, 5, 6, 7)) // expect: 28
 
 var f8 = fn(a, b, c, d, e, f, g, h) a + b + c + d + e + f + g + h
-IO.write(f8.call(1, 2, 3, 4, 5, 6, 7, 8)) // expect: 36
+IO.print(f8.call(1, 2, 3, 4, 5, 6, 7, 8)) // expect: 36
 
 var f9 = fn(a, b, c, d, e, f, g, h, i) a + b + c + d + e + f + g + h + i
-IO.write(f9.call(1, 2, 3, 4, 5, 6, 7, 8, 9)) // expect: 45
+IO.print(f9.call(1, 2, 3, 4, 5, 6, 7, 8, 9)) // expect: 45
 
 var f10 = fn(a, b, c, d, e, f, g, h, i, j) a + b + c + d + e + f + g + h + i + j
-IO.write(f10.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)) // expect: 55
+IO.print(f10.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)) // expect: 55
 
 var f11 = fn(a, b, c, d, e, f, g, h, i, j, k) a + b + c + d + e + f + g + h + i + j + k
-IO.write(f11.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11)) // expect: 66
+IO.print(f11.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11)) // expect: 66
 
 var f12 = fn(a, b, c, d, e, f, g, h, i, j, k, l) a + b + c + d + e + f + g + h + i + j + k + l
-IO.write(f12.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)) // expect: 78
+IO.print(f12.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)) // expect: 78
 
 var f13 = fn(a, b, c, d, e, f, g, h, i, j, k, l, m) a + b + c + d + e + f + g + h + i + j + k + l + m
-IO.write(f13.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)) // expect: 91
+IO.print(f13.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)) // expect: 91
 
 var f14 = fn(a, b, c, d, e, f, g, h, i, j, k, l, m, n) a + b + c + d + e + f + g + h + i + j + k + l + m + n
-IO.write(f14.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)) // expect: 105
+IO.print(f14.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)) // expect: 105
 
 var f15 = fn(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) a + b + c + d + e + f + g + h + i + j + k + l + m + n + o
-IO.write(f15.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)) // expect: 120
+IO.print(f15.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)) // expect: 120
 
 var f16 = fn(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p) a + b + c + d + e + f + g + h + i + j + k + l + m + n + o + p
-IO.write(f16.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)) // expect: 136
+IO.print(f16.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)) // expect: 136
diff --git a/test/function/syntax.wren b/test/function/syntax.wren
index 187011ea..07115b67 100644
--- a/test/function/syntax.wren
+++ b/test/function/syntax.wren
@@ -1,31 +1,31 @@
 // Single expression body.
-(fn IO.write("ok")).call // expect: ok
+(fn IO.print("ok")).call // expect: ok
 
 // TODO: Precedence of fn body.
 
 // Curly body.
 fn {
-  IO.write("ok") // expect: ok
+  IO.print("ok") // expect: ok
 }.call
 
 // No trailing newline.
 fn {
-  IO.write("ok") }.call // expect: ok
+  IO.print("ok") }.call // expect: ok
 
 // Multiple expressions.
 fn {
-  IO.write("1") // expect: 1
-  IO.write("2") // expect: 2
+  IO.print("1") // expect: 1
+  IO.print("2") // expect: 2
 }.call
 
 // Extra newlines.
 fn {
 
 
-  IO.write("1") // expect: 1
+  IO.print("1") // expect: 1
 
 
-  IO.write("2") // expect: 2
+  IO.print("2") // expect: 2
 
 
 }.call
diff --git a/test/function/type.wren b/test/function/type.wren
index debf5023..65dced36 100644
--- a/test/function/type.wren
+++ b/test/function/type.wren
@@ -1,4 +1,4 @@
-IO.write((fn 0) is Function)      // expect: true
-IO.write((fn 0) is Object)        // expect: true
-IO.write((fn 0) is String)        // expect: false
-IO.write((fn 0).type == Function) // expect: true
+IO.print((fn 0) is Function)      // expect: true
+IO.print((fn 0) is Object)        // expect: true
+IO.print((fn 0) is String)        // expect: false
+IO.print((fn 0).type == Function) // expect: true
diff --git a/test/grammar.wren b/test/grammar.wren
index a3b6235e..36590f70 100644
--- a/test/grammar.wren
+++ b/test/grammar.wren
@@ -1,31 +1,31 @@
 // * has higher precedence than +.
-IO.write(2 + 3 * 4) // expect: 14
+IO.print(2 + 3 * 4) // expect: 14
 
 // * has higher precedence than -.
-IO.write(20 - 3 * 4) // expect: 8
+IO.print(20 - 3 * 4) // expect: 8
 
 // / has higher precedence than +.
-IO.write(2 + 6 / 3) // expect: 4
+IO.print(2 + 6 / 3) // expect: 4
 
 // / has higher precedence than -.
-IO.write(2 - 6 / 3) // expect: 0
+IO.print(2 - 6 / 3) // expect: 0
 
 // < has higher precedence than ==.
-IO.write(false == 2 < 1) // expect: true
+IO.print(false == 2 < 1) // expect: true
 
 // > has higher precedence than ==.
-IO.write(false == 1 > 2) // expect: true
+IO.print(false == 1 > 2) // expect: true
 
 // <= has higher precedence than ==.
-IO.write(false == 2 <= 1) // expect: true
+IO.print(false == 2 <= 1) // expect: true
 
 // >= has higher precedence than ==.
-IO.write(false == 1 >= 2) // expect: true
+IO.print(false == 1 >= 2) // expect: true
 
 // Unary - has lower precedence than ..
-IO.write(-"abc".count) // expect: -3
+IO.print(-"abc".count) // expect: -3
 
 // TODO: %, associativity.
 
 // Using () for grouping.
-IO.write((2 * (6 - (2 + 2)))) // expect: 4
+IO.print((2 * (6 - (2 + 2)))) // expect: 4
diff --git a/test/if.wren b/test/if.wren
index 379f666c..023b7fb8 100644
--- a/test/if.wren
+++ b/test/if.wren
@@ -1,28 +1,28 @@
 // Evaluate the 'then' expression if the condition is true.
-if (true) IO.write("good") // expect: good
-if (false) IO.write("bad")
+if (true) IO.print("good") // expect: good
+if (false) IO.print("bad")
 
 // Evaluate the 'else' expression if the condition is false.
-if (true) IO.write("good") else IO.write("bad") // expect: good
-if (false) IO.write("bad") else IO.write("good") // expect: good
+if (true) IO.print("good") else IO.print("bad") // expect: good
+if (false) IO.print("bad") else IO.print("good") // expect: good
 
 // Allow blocks for branches.
-if (true) { IO.write("block") } // expect: block
-if (false) null else { IO.write("block") } // expect: block
+if (true) { IO.print("block") } // expect: block
+if (false) null else { IO.print("block") } // expect: block
 
 // Assignment in if condition.
 var a = false
-if (a = true) IO.write(a) // expect: true
+if (a = true) IO.print(a) // expect: true
 
 // Newline after "if".
 if
-(true) IO.write("good") // expect: good
+(true) IO.print("good") // expect: good
 
 // Newline after "else".
-if (false) IO.write("bad") else
-IO.write("good") // expect: good
+if (false) IO.print("bad") else
+IO.print("good") // expect: good
 
 // Only false is falsy.
-if (0) IO.write(0) // expect: 0
-if (null) IO.write(null) // expect: null
-if ("") IO.write("empty") // expect: empty
+if (0) IO.print(0) // expect: 0
+if (null) IO.print(null) // expect: null
+if ("") IO.print("empty") // expect: empty
diff --git a/test/inheritance/inherit_fields.wren b/test/inheritance/inherit_fields.wren
index 799a87d0..90d713fa 100644
--- a/test/inheritance/inherit_fields.wren
+++ b/test/inheritance/inherit_fields.wren
@@ -5,8 +5,8 @@ class Foo {
   }
 
   fooPrint {
-    IO.write(_field1)
-    IO.write(_field2)
+    IO.print(_field1)
+    IO.print(_field2)
   }
 }
 
@@ -17,8 +17,8 @@ class Bar is Foo {
   }
 
   barPrint {
-    IO.write(_field1)
-    IO.write(_field2)
+    IO.print(_field1)
+    IO.print(_field2)
   }
 }
 
diff --git a/test/inheritance/inherit_methods.wren b/test/inheritance/inherit_methods.wren
index b755f539..2308d37b 100644
--- a/test/inheritance/inherit_methods.wren
+++ b/test/inheritance/inherit_methods.wren
@@ -1,15 +1,15 @@
 class Foo {
-  methodOnFoo { IO.write("foo") }
-  method(a) { IO.write("foo") }
-  method(a, b, c) { IO.write("foo") }
-  override { IO.write("foo") }
+  methodOnFoo { IO.print("foo") }
+  method(a) { IO.print("foo") }
+  method(a, b, c) { IO.print("foo") }
+  override { IO.print("foo") }
 }
 
 class Bar is Foo {
-  methodOnBar { IO.write("bar") }
-  method(a, b) { IO.write("bar") }
-  method(a, b, c, d) { IO.write("bar") }
-  override { IO.write("bar") }
+  methodOnBar { IO.print("bar") }
+  method(a, b) { IO.print("bar") }
+  method(a, b, c, d) { IO.print("bar") }
+  override { IO.print("bar") }
 }
 
 var bar = new Bar
diff --git a/test/inheritance/inherit_static_methods.wren b/test/inheritance/inherit_static_methods.wren
index 0f651fc2..148c5292 100644
--- a/test/inheritance/inherit_static_methods.wren
+++ b/test/inheritance/inherit_static_methods.wren
@@ -1,15 +1,15 @@
 class Foo {
-  static methodOnFoo { IO.write("foo") }
-  static method(a) { IO.write("foo") }
-  static method(a, b, c) { IO.write("foo") }
-  static override { IO.write("foo") }
+  static methodOnFoo { IO.print("foo") }
+  static method(a) { IO.print("foo") }
+  static method(a, b, c) { IO.print("foo") }
+  static override { IO.print("foo") }
 }
 
 class Bar is Foo {
-  static methodOnBar { IO.write("bar") }
-  static method(a, b) { IO.write("bar") }
-  static method(a, b, c, d) { IO.write("bar") }
-  static override { IO.write("bar") }
+  static methodOnBar { IO.print("bar") }
+  static method(a, b) { IO.print("bar") }
+  static method(a, b, c, d) { IO.print("bar") }
+  static override { IO.print("bar") }
 }
 
 Bar.methodOnFoo // expect: foo
diff --git a/test/inheritance/is.wren b/test/inheritance/is.wren
index 14ac0d0a..5c865e00 100644
--- a/test/inheritance/is.wren
+++ b/test/inheritance/is.wren
@@ -5,12 +5,12 @@ var a = new A
 var b = new B
 var c = new C
 
-IO.write(a is A) // expect: true
-IO.write(a is B) // expect: false
-IO.write(a is C) // expect: false
-IO.write(b is A) // expect: true
-IO.write(b is B) // expect: true
-IO.write(b is C) // expect: false
-IO.write(c is A) // expect: true
-IO.write(c is B) // expect: true
-IO.write(c is C) // expect: true
+IO.print(a is A) // expect: true
+IO.print(a is B) // expect: false
+IO.print(a is C) // expect: false
+IO.print(b is A) // expect: true
+IO.print(b is B) // expect: true
+IO.print(b is C) // expect: false
+IO.print(c is A) // expect: true
+IO.print(c is B) // expect: true
+IO.print(c is C) // expect: true
diff --git a/test/io/write.wren b/test/io/write.wren
index 10e2b867..d2fb84e7 100644
--- a/test/io/write.wren
+++ b/test/io/write.wren
@@ -3,10 +3,10 @@ class Foo {
 }
 
 // Calls toString on argument.
-IO.write(new Foo) // expect: Foo.toString
+IO.print(new Foo) // expect: Foo.toString
 
 // Returns argument.
-var result = IO.write(123) // expect: 123
-IO.write(result == 123) // expect: true
+var result = IO.print(123) // expect: 123
+IO.print(result == 123) // expect: true
 
 // TODO: What if toString on argument doesn't return a string?
diff --git a/test/is.wren b/test/is.wren
index 3b47b9ca..0b03a8de 100644
--- a/test/is.wren
+++ b/test/is.wren
@@ -1,32 +1,32 @@
-IO.write(Num is Class) // expect: true
-IO.write(true is Bool) // expect: true
-IO.write((fn 1) is Function) // expect: true
-IO.write(123 is Num) // expect: true
-IO.write(null is Null) // expect: true
-IO.write("s" is String) // expect: true
+IO.print(Num is Class) // expect: true
+IO.print(true is Bool) // expect: true
+IO.print((fn 1) is Function) // expect: true
+IO.print(123 is Num) // expect: true
+IO.print(null is Null) // expect: true
+IO.print("s" is String) // expect: true
 
-IO.write(Num is Bool) // expect: false
-IO.write(null is Class) // expect: false
-IO.write(true is Function) // expect: false
-IO.write((fn 1) is Num) // expect: false
-IO.write("s" is Null) // expect: false
-IO.write(123 is String) // expect: false
+IO.print(Num is Bool) // expect: false
+IO.print(null is Class) // expect: false
+IO.print(true is Function) // expect: false
+IO.print((fn 1) is Num) // expect: false
+IO.print("s" is Null) // expect: false
+IO.print(123 is String) // expect: false
 
 // Everything extends Object.
-IO.write(Num is Object) // expect: true
-IO.write(null is Object) // expect: true
-IO.write(true is Object) // expect: true
-IO.write((fn 1) is Object) // expect: true
-IO.write("s" is Object) // expect: true
-IO.write(123 is Object) // expect: true
+IO.print(Num is Object) // expect: true
+IO.print(null is Object) // expect: true
+IO.print(true is Object) // expect: true
+IO.print((fn 1) is Object) // expect: true
+IO.print("s" is Object) // expect: true
+IO.print(123 is Object) // expect: true
 
 // Classes extend Class.
-IO.write(Num is Class) // expect: true
-IO.write(null is Class) // expect: false
-IO.write(true is Class) // expect: false
-IO.write((fn 1) is Class) // expect: false
-IO.write("s" is Class) // expect: false
-IO.write(123 is Class) // expect: false
+IO.print(Num is Class) // expect: true
+IO.print(null is Class) // expect: false
+IO.print(true is Class) // expect: false
+IO.print((fn 1) is Class) // expect: false
+IO.print("s" is Class) // expect: false
+IO.print(123 is Class) // expect: false
 
 // TODO: Non-class on RHS.
 // TODO: Precedence and associativity.
diff --git a/test/limit/long_function.wren b/test/limit/long_function.wren
index ef259f23..84fe5ba2 100644
--- a/test/limit/long_function.wren
+++ b/test/limit/long_function.wren
@@ -1,1013 +1,1013 @@
 fn {
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
   // 100
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
   // 200
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
   // 300
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
   // 400
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
   // 500
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
   // 600
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
   // 700
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
   // 800
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
   // 900
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
-  IO.write(1) // expect: 1
-  IO.write(2) // expect: 2
-  IO.write(3) // expect: 3
-  IO.write(4) // expect: 4
-  IO.write(5) // expect: 5
-  IO.write(6) // expect: 6
-  IO.write(7) // expect: 7
-  IO.write(8) // expect: 8
-  IO.write(9) // expect: 9
-  IO.write(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
+  IO.print(1) // expect: 1
+  IO.print(2) // expect: 2
+  IO.print(3) // expect: 3
+  IO.print(4) // expect: 4
+  IO.print(5) // expect: 5
+  IO.print(6) // expect: 6
+  IO.print(7) // expect: 7
+  IO.print(8) // expect: 8
+  IO.print(9) // expect: 9
+  IO.print(10) // expect: 10
   // 1000
 }.call
 
diff --git a/test/limit/long_string.wren b/test/limit/long_string.wren
index cd68aa9f..eeb7724d 100644
--- a/test/limit/long_string.wren
+++ b/test/limit/long_string.wren
@@ -1,6 +1,6 @@
 // Create a very long string containing escape sequences.
 var s = "1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\n1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\n1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\n1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\n1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\n1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\n1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\n1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\n1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\n1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890\"1234567890"
-IO.write(s)
+IO.print(s)
 // expect: 1234567890"1234567890"1234567890"1234567890"1234567890"1234567890"1234567890"1234567890"1234567890"1234567890
 // expect: 1234567890"1234567890"1234567890"1234567890"1234567890"1234567890"1234567890"1234567890"1234567890"1234567890
 // expect: 1234567890"1234567890"1234567890"1234567890"1234567890"1234567890"1234567890"1234567890"1234567890"1234567890
diff --git a/test/limit/many_constants.wren b/test/limit/many_constants.wren
index f6b6c90e..2fe3c52d 100644
--- a/test/limit/many_constants.wren
+++ b/test/limit/many_constants.wren
@@ -8191,7 +8191,7 @@ var f = fn {
   65513; 65514; 65515; 65516; 65517; 65518; 65519; 65520;
   65521; 65522; 65523; 65524; 65525; 65526; 65527; 65528;
   65529; 65530; 65531; 65532; 65533; 65534; 65535;
-  IO.write(65536)
+  IO.print(65536)
 }
 
 f.call // expect: 65536
diff --git a/test/list/add.wren b/test/list/add.wren
index 10800dbb..a9785246 100644
--- a/test/list/add.wren
+++ b/test/list/add.wren
@@ -1,10 +1,10 @@
 var a = []
 a.add(1)
-IO.write(a) // expect: [1]
+IO.print(a) // expect: [1]
 a.add(2)
-IO.write(a) // expect: [1, 2]
+IO.print(a) // expect: [1, 2]
 a.add(3)
-IO.write(a) // expect: [1, 2, 3]
+IO.print(a) // expect: [1, 2, 3]
 
 // Returns added element.
-IO.write(a.add(4)) // expect: 4
+IO.print(a.add(4)) // expect: 4
diff --git a/test/list/clear.wren b/test/list/clear.wren
index dc931356..28a4bfb4 100644
--- a/test/list/clear.wren
+++ b/test/list/clear.wren
@@ -1,7 +1,7 @@
 var a = [1, 2, 3]
 a.clear
-IO.write(a)       // expect: []
-IO.write(a.count) // expect: 0
+IO.print(a)       // expect: []
+IO.print(a.count) // expect: 0
 
 // Returns null.
-IO.write([1, 2].clear) // expect: null
+IO.print([1, 2].clear) // expect: null
diff --git a/test/list/count.wren b/test/list/count.wren
index c0728157..9b5c2f10 100644
--- a/test/list/count.wren
+++ b/test/list/count.wren
@@ -1,3 +1,3 @@
-IO.write([].count)           // expect: 0
-IO.write([1].count)          // expect: 1
-IO.write([1, 2, 3, 4].count) // expect: 4
+IO.print([].count)           // expect: 0
+IO.print([1].count)          // expect: 1
+IO.print([1, 2, 3, 4].count) // expect: 4
diff --git a/test/list/insert.wren b/test/list/insert.wren
index 9a306a58..44097630 100644
--- a/test/list/insert.wren
+++ b/test/list/insert.wren
@@ -1,41 +1,41 @@
 // Add to empty list.
 var a = []
 a.insert(1, 0)
-IO.write(a) // expect: [1]
+IO.print(a) // expect: [1]
 
 // Normal indices.
 var b = [1, 2, 3]
 b.insert(4, 0)
-IO.write(b) // expect: [4, 1, 2, 3]
+IO.print(b) // expect: [4, 1, 2, 3]
 
 var c = [1, 2, 3]
 c.insert(4, 1)
-IO.write(c) // expect: [1, 4, 2, 3]
+IO.print(c) // expect: [1, 4, 2, 3]
 
 var d = [1, 2, 3]
 d.insert(4, 2)
-IO.write(d) // expect: [1, 2, 4, 3]
+IO.print(d) // expect: [1, 2, 4, 3]
 
 var e = [1, 2, 3]
 e.insert(4, 3)
-IO.write(e) // expect: [1, 2, 3, 4]
+IO.print(e) // expect: [1, 2, 3, 4]
 
 // Negative indices.
 var f = [1, 2, 3]
 f.insert(4, -4)
-IO.write(f) // expect: [4, 1, 2, 3]
+IO.print(f) // expect: [4, 1, 2, 3]
 
 var g = [1, 2, 3]
 g.insert(4, -3)
-IO.write(g) // expect: [1, 4, 2, 3]
+IO.print(g) // expect: [1, 4, 2, 3]
 
 var h = [1, 2, 3]
 h.insert(4, -2)
-IO.write(h) // expect: [1, 2, 4, 3]
+IO.print(h) // expect: [1, 2, 4, 3]
 
 var i = [1, 2, 3]
 i.insert(4, -1)
-IO.write(i) // expect: [1, 2, 3, 4]
+IO.print(i) // expect: [1, 2, 3, 4]
 
 // Returns.inserted value.
-IO.write([1, 2].insert(3, 0)) // expect: 3
+IO.print([1, 2].insert(3, 0)) // expect: 3
diff --git a/test/list/iterate.wren b/test/list/iterate.wren
index 40cd3c93..8c9e3c61 100644
--- a/test/list/iterate.wren
+++ b/test/list/iterate.wren
@@ -1,7 +1,7 @@
 var a = ["one", "two", "three", "four"]
-IO.write(a.iterate(null)) // expect: 0
-IO.write(a.iterate(0)) // expect: 1
-IO.write(a.iterate(1)) // expect: 2
-IO.write(a.iterate(2)) // expect: 3
-IO.write(a.iterate(3)) // expect: false
-IO.write(a.iterate(-1)) // expect: false
+IO.print(a.iterate(null)) // expect: 0
+IO.print(a.iterate(0)) // expect: 1
+IO.print(a.iterate(1)) // expect: 2
+IO.print(a.iterate(2)) // expect: 3
+IO.print(a.iterate(3)) // expect: false
+IO.print(a.iterate(-1)) // expect: false
diff --git a/test/list/iterator_value.wren b/test/list/iterator_value.wren
index 116ce374..899dbc67 100644
--- a/test/list/iterator_value.wren
+++ b/test/list/iterator_value.wren
@@ -1,5 +1,5 @@
 var a = ["one", "two", "three", "four"]
-IO.write(a.iteratorValue(0)) // expect: one
-IO.write(a.iteratorValue(1)) // expect: two
-IO.write(a.iteratorValue(2)) // expect: three
-IO.write(a.iteratorValue(3)) // expect: four
+IO.print(a.iteratorValue(0)) // expect: one
+IO.print(a.iteratorValue(1)) // expect: two
+IO.print(a.iteratorValue(2)) // expect: three
+IO.print(a.iteratorValue(3)) // expect: four
diff --git a/test/list/newlines.wren b/test/list/newlines.wren
index 3415df80..81873d8a 100644
--- a/test/list/newlines.wren
+++ b/test/list/newlines.wren
@@ -8,7 +8,7 @@ var list = [
 
 ]
 
-IO.write(list[0]) // expect: a
-IO.write(list[1]) // expect: b
-IO.write(list[2]) // expect: c
-IO.write(list[3]) // expect: d
+IO.print(list[0]) // expect: a
+IO.print(list[1]) // expect: b
+IO.print(list[2]) // expect: c
+IO.print(list[3]) // expect: d
diff --git a/test/list/remove_at.wren b/test/list/remove_at.wren
index ff1eed51..1668b20b 100644
--- a/test/list/remove_at.wren
+++ b/test/list/remove_at.wren
@@ -1,27 +1,27 @@
 var a = [1, 2, 3]
 a.removeAt(0)
-IO.write(a) // expect: [2, 3]
+IO.print(a) // expect: [2, 3]
 
 var b = [1, 2, 3]
 b.removeAt(1)
-IO.write(b) // expect: [1, 3]
+IO.print(b) // expect: [1, 3]
 
 var c = [1, 2, 3]
 c.removeAt(2)
-IO.write(c) // expect: [1, 2]
+IO.print(c) // expect: [1, 2]
 
 // Index backwards from end.
 var d = [1, 2, 3]
 d.removeAt(-3)
-IO.write(d) // expect: [2, 3]
+IO.print(d) // expect: [2, 3]
 
 var e = [1, 2, 3]
 e.removeAt(-2)
-IO.write(e) // expect: [1, 3]
+IO.print(e) // expect: [1, 3]
 
 var f = [1, 2, 3]
 f.removeAt(-1)
-IO.write(f) // expect: [1, 2]
+IO.print(f) // expect: [1, 2]
 
 // Return the removed value.
-IO.write([3, 4, 5].removeAt(1)) // expect: 4
+IO.print([3, 4, 5].removeAt(1)) // expect: 4
diff --git a/test/list/subscript.wren b/test/list/subscript.wren
index 9b541575..8b38e3c3 100644
--- a/test/list/subscript.wren
+++ b/test/list/subscript.wren
@@ -1,12 +1,12 @@
 // Returns elements.
 var list = ["a", "b", "c", "d"]
-IO.write(list[0]) // expect: a
-IO.write(list[1]) // expect: b
-IO.write(list[2]) // expect: c
-IO.write(list[3]) // expect: d
+IO.print(list[0]) // expect: a
+IO.print(list[1]) // expect: b
+IO.print(list[2]) // expect: c
+IO.print(list[3]) // expect: d
 
 // Allows indexing backwards from the end.
-IO.write(list[-4]) // expect: a
-IO.write(list[-3]) // expect: b
-IO.write(list[-2]) // expect: c
-IO.write(list[-1]) // expect: d
+IO.print(list[-4]) // expect: a
+IO.print(list[-3]) // expect: b
+IO.print(list[-2]) // expect: c
+IO.print(list[-1]) // expect: d
diff --git a/test/list/subscript_setter.wren b/test/list/subscript_setter.wren
index d05f4ca8..d7e567de 100644
--- a/test/list/subscript_setter.wren
+++ b/test/list/subscript_setter.wren
@@ -4,13 +4,13 @@
   list[0] = 5
   list[1] = 6
   list[2] = 7
-  IO.write(list) // expect: [5, 6, 7]
+  IO.print(list) // expect: [5, 6, 7]
 }
 
 // Returns right-hand side.
 {
   var list = [1, 2, 3]
-  IO.write(list[1] = 5) // expect: 5
+  IO.print(list[1] = 5) // expect: 5
 }
 
 // Negative indices.
@@ -19,7 +19,7 @@
   list[-1] = 5
   list[-2] = 6
   list[-3] = 7
-  IO.write(list) // expect: [7, 6, 5]
+  IO.print(list) // expect: [7, 6, 5]
 }
 
 // TODO: Handle out of range.
diff --git a/test/list/to_string.wren b/test/list/to_string.wren
index 1af1282f..75cd4cc0 100644
--- a/test/list/to_string.wren
+++ b/test/list/to_string.wren
@@ -1,17 +1,17 @@
 // Handle empty list.
-IO.write([].toString)             // expect: []
+IO.print([].toString)             // expect: []
 
 // Does not quote strings.
-IO.write([1, "2", true].toString) // expect: [1, 2, true]
+IO.print([1, "2", true].toString) // expect: [1, 2, true]
 
 // Nested lists.
-IO.write([1, [2, [3], 4], 5]) // expect: [1, [2, [3], 4], 5]
+IO.print([1, [2, [3], 4], 5]) // expect: [1, [2, [3], 4], 5]
 
 // Calls toString on elements.
 class Foo {
   toString { return "Foo.toString" }
 }
 
-IO.write([1, new Foo, 2]) // expect: [1, Foo.toString, 2]
+IO.print([1, new Foo, 2]) // expect: [1, Foo.toString, 2]
 
 // TODO: Handle lists that contain themselves.
diff --git a/test/list/type.wren b/test/list/type.wren
index 388aaa02..5f63fe6f 100644
--- a/test/list/type.wren
+++ b/test/list/type.wren
@@ -1,4 +1,4 @@
-IO.write([] is List)      // expect: true
-IO.write([] is Object)    // expect: true
-IO.write([] is Bool)      // expect: false
-IO.write([].type == List) // expect: true
+IO.print([] is List)      // expect: true
+IO.print([] is Object)    // expect: true
+IO.print([] is Bool)      // expect: false
+IO.print([].type == List) // expect: true
diff --git a/test/method/arity.wren b/test/method/arity.wren
index 9c8d523a..41ac7343 100644
--- a/test/method/arity.wren
+++ b/test/method/arity.wren
@@ -19,20 +19,20 @@ class Foo {
 }
 
 var foo = new Foo
-IO.write(foo.method) // expect: 0
-IO.write(foo.method(1)) // expect: 1
-IO.write(foo.method(1, 2)) // expect: 3
-IO.write(foo.method(1, 2, 3)) // expect: 6
-IO.write(foo.method(1, 2, 3, 4)) // expect: 10
-IO.write(foo.method(1, 2, 3, 4, 5)) // expect: 15
-IO.write(foo.method(1, 2, 3, 4, 5, 6)) // expect: 21
-IO.write(foo.method(1, 2, 3, 4, 5, 6, 7)) // expect: 28
-IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8)) // expect: 36
-IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9)) // expect: 45
-IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)) // expect: 55
-IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11)) // expect: 66
-IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)) // expect: 78
-IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)) // expect: 91
-IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)) // expect: 105
-IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)) // expect: 120
-IO.write(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)) // expect: 136
+IO.print(foo.method) // expect: 0
+IO.print(foo.method(1)) // expect: 1
+IO.print(foo.method(1, 2)) // expect: 3
+IO.print(foo.method(1, 2, 3)) // expect: 6
+IO.print(foo.method(1, 2, 3, 4)) // expect: 10
+IO.print(foo.method(1, 2, 3, 4, 5)) // expect: 15
+IO.print(foo.method(1, 2, 3, 4, 5, 6)) // expect: 21
+IO.print(foo.method(1, 2, 3, 4, 5, 6, 7)) // expect: 28
+IO.print(foo.method(1, 2, 3, 4, 5, 6, 7, 8)) // expect: 36
+IO.print(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9)) // expect: 45
+IO.print(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)) // expect: 55
+IO.print(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11)) // expect: 66
+IO.print(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)) // expect: 78
+IO.print(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)) // expect: 91
+IO.print(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)) // expect: 105
+IO.print(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)) // expect: 120
+IO.print(foo.method(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)) // expect: 136
diff --git a/test/method/empty_block.wren b/test/method/empty_block.wren
index da578d24..4ee5aa7b 100644
--- a/test/method/empty_block.wren
+++ b/test/method/empty_block.wren
@@ -2,4 +2,4 @@ class Foo {
   bar {}
 }
 
-IO.write((new Foo).bar) // expect: null
+IO.print((new Foo).bar) // expect: null
diff --git a/test/method/long_name.wren b/test/method/long_name.wren
index 9d5bd5a0..c95363b9 100644
--- a/test/method/long_name.wren
+++ b/test/method/long_name.wren
@@ -4,4 +4,4 @@ class Foo {
   }
 }
 
-IO.write((new Foo).thisHasAMethodNameThatIsExactly64CharactersLongWhichIsTheMaximum) // expect: result
+IO.print((new Foo).thisHasAMethodNameThatIsExactly64CharactersLongWhichIsTheMaximum) // expect: result
diff --git a/test/method/many_methods.wren b/test/method/many_methods.wren
index 0cff874d..d0586c50 100644
--- a/test/method/many_methods.wren
+++ b/test/method/many_methods.wren
@@ -2021,4 +2021,4 @@ result = result + foo.method996
 result = result + foo.method997
 result = result + foo.method998
 result = result + foo.method999
-IO.write(result) // expect: 1000
+IO.print(result) // expect: 1000
diff --git a/test/method/operators.wren b/test/method/operators.wren
index dd76fd49..48fa74dd 100644
--- a/test/method/operators.wren
+++ b/test/method/operators.wren
@@ -16,16 +16,16 @@ class Foo {
 }
 
 var foo = new Foo
-IO.write(foo + "a") // expect: infix + a
-IO.write(foo - "a") // expect: infix - a
-IO.write(foo * "a") // expect: infix * a
-IO.write(foo / "a") // expect: infix / a
-IO.write(foo % "a") // expect: infix % a
-IO.write(foo < "a") // expect: infix < a
-IO.write(foo > "a") // expect: infix > a
-IO.write(foo <= "a") // expect: infix <= a
-IO.write(foo >= "a") // expect: infix >= a
-IO.write(foo == "a") // expect: infix == a
-IO.write(foo != "a") // expect: infix != a
-IO.write(!foo) // expect: prefix !
-IO.write(-foo) // expect: prefix -
+IO.print(foo + "a") // expect: infix + a
+IO.print(foo - "a") // expect: infix - a
+IO.print(foo * "a") // expect: infix * a
+IO.print(foo / "a") // expect: infix / a
+IO.print(foo % "a") // expect: infix % a
+IO.print(foo < "a") // expect: infix < a
+IO.print(foo > "a") // expect: infix > a
+IO.print(foo <= "a") // expect: infix <= a
+IO.print(foo >= "a") // expect: infix >= a
+IO.print(foo == "a") // expect: infix == a
+IO.print(foo != "a") // expect: infix != a
+IO.print(!foo) // expect: prefix !
+IO.print(-foo) // expect: prefix -
diff --git a/test/method/static.wren b/test/method/static.wren
index cb7b42e8..660825c0 100644
--- a/test/method/static.wren
+++ b/test/method/static.wren
@@ -6,7 +6,7 @@ class Foo {
   static bar(arg) { return "on metaclass " + arg }
 }
 
-IO.write((new Foo).bar)        // expect: on instance
-IO.write(Foo.bar)              // expect: on metaclass
-IO.write((new Foo).bar("arg")) // expect: on instance arg
-IO.write(Foo.bar("arg"))       // expect: on metaclass arg
+IO.print((new Foo).bar)        // expect: on instance
+IO.print(Foo.bar)              // expect: on metaclass
+IO.print((new Foo).bar("arg")) // expect: on instance arg
+IO.print(Foo.bar("arg"))       // expect: on metaclass arg
diff --git a/test/method/too_many_arguments.wren b/test/method/too_many_arguments.wren
index 00ea17b9..c49643b8 100644
--- a/test/method/too_many_arguments.wren
+++ b/test/method/too_many_arguments.wren
@@ -1 +1 @@
-IO.write(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17) // expect error
+IO.print(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17) // expect error
diff --git a/test/no_trailing_newline.wren b/test/no_trailing_newline.wren
index 69f16d12..0b7bfa9e 100644
--- a/test/no_trailing_newline.wren
+++ b/test/no_trailing_newline.wren
@@ -1 +1 @@
-IO.write("ok") // expect: ok
\ No newline at end of file
+IO.print("ok") // expect: ok
\ No newline at end of file
diff --git a/test/null.wren b/test/null.wren
index cd77fc3d..8f59128c 100644
--- a/test/null.wren
+++ b/test/null.wren
@@ -1 +1 @@
-IO.write(null) // expect: null
+IO.print(null) // expect: null
diff --git a/test/null_type.wren b/test/null_type.wren
index 2503e8ce..3fdb2628 100644
--- a/test/null_type.wren
+++ b/test/null_type.wren
@@ -1,4 +1,4 @@
-IO.write(null is Null)      // expect: true
-IO.write(null is Object)    // expect: true
-IO.write(null is Bool)      // expect: false
-IO.write(null.type == Null) // expect: true
+IO.print(null is Null)      // expect: true
+IO.print(null is Object)    // expect: true
+IO.print(null is Bool)      // expect: false
+IO.print(null.type == Null) // expect: true
diff --git a/test/number/abs.wren b/test/number/abs.wren
index 5b30aab1..31c1e444 100644
--- a/test/number/abs.wren
+++ b/test/number/abs.wren
@@ -1,6 +1,6 @@
-IO.write(123.abs)    // expect: 123
-IO.write(-123.abs)   // expect: 123
-IO.write(0.abs)      // expect: 0
-IO.write(-0.abs)     // expect: 0
-IO.write(-0.12.abs)  // expect: 0.12
-IO.write(12.34.abs)  // expect: 12.34
+IO.print(123.abs)    // expect: 123
+IO.print(-123.abs)   // expect: 123
+IO.print(0.abs)      // expect: 0
+IO.print(-0.abs)     // expect: 0
+IO.print(-0.12.abs)  // expect: 0.12
+IO.print(12.34.abs)  // expect: 12.34
diff --git a/test/number/bitwise_not.wren b/test/number/bitwise_not.wren
index 6eddb7ec..06676c4a 100644
--- a/test/number/bitwise_not.wren
+++ b/test/number/bitwise_not.wren
@@ -1,22 +1,22 @@
-IO.write(~0) // expect: 4294967295
-IO.write(~1) // expect: 4294967294
-IO.write(~23) // expect: 4294967272
+IO.print(~0) // expect: 4294967295
+IO.print(~1) // expect: 4294967294
+IO.print(~23) // expect: 4294967272
 
 // Max u32 value.
-IO.write(~4294967295) // expect: 0
+IO.print(~4294967295) // expect: 0
 
 // Past max u32 value.
-IO.write(~4294967296) // expect: 4294967295
+IO.print(~4294967296) // expect: 4294967295
 
 // Negative numbers.
-IO.write(~-1) // expect: 0
-IO.write(~-123) // expect: 122
-IO.write(~-4294967294) // expect: 4294967293
-IO.write(~-4294967295) // expect: 4294967294
-IO.write(~-4294967296) // expect: 4294967295
+IO.print(~-1) // expect: 0
+IO.print(~-123) // expect: 122
+IO.print(~-4294967294) // expect: 4294967293
+IO.print(~-4294967295) // expect: 4294967294
+IO.print(~-4294967296) // expect: 4294967295
 
 // Floating point values.
-IO.write(~1.23) // expect: 4294967294
-IO.write(~0.00123) // expect: 4294967295
-IO.write(~345.67) // expect: 4294966950
-IO.write(~-12.34) // expect: 11
+IO.print(~1.23) // expect: 4294967294
+IO.print(~0.00123) // expect: 4294967295
+IO.print(~345.67) // expect: 4294966950
+IO.print(~-12.34) // expect: 11
diff --git a/test/number/comparison.wren b/test/number/comparison.wren
index 4a3c07aa..8cee6c47 100644
--- a/test/number/comparison.wren
+++ b/test/number/comparison.wren
@@ -1,27 +1,27 @@
-IO.write(1 < 2)    // expect: true
-IO.write(2 < 2)    // expect: false
-IO.write(2 < 1)    // expect: false
+IO.print(1 < 2)    // expect: true
+IO.print(2 < 2)    // expect: false
+IO.print(2 < 1)    // expect: false
 
-IO.write(1 <= 2)    // expect: true
-IO.write(2 <= 2)    // expect: true
-IO.write(2 <= 1)    // expect: false
+IO.print(1 <= 2)    // expect: true
+IO.print(2 <= 2)    // expect: true
+IO.print(2 <= 1)    // expect: false
 
-IO.write(1 > 2)    // expect: false
-IO.write(2 > 2)    // expect: false
-IO.write(2 > 1)    // expect: true
+IO.print(1 > 2)    // expect: false
+IO.print(2 > 2)    // expect: false
+IO.print(2 > 1)    // expect: true
 
-IO.write(1 >= 2)    // expect: false
-IO.write(2 >= 2)    // expect: true
-IO.write(2 >= 1)    // expect: true
+IO.print(1 >= 2)    // expect: false
+IO.print(2 >= 2)    // expect: true
+IO.print(2 >= 1)    // expect: true
 
 // Zero and negative zero compare the same.
-IO.write(0 < -0) // expect: false
-IO.write(-0 < 0) // expect: false
-IO.write(0 > -0) // expect: false
-IO.write(-0 > 0) // expect: false
-IO.write(0 <= -0) // expect: true
-IO.write(-0 <= 0) // expect: true
-IO.write(0 >= -0) // expect: true
-IO.write(-0 >= 0) // expect: true
+IO.print(0 < -0) // expect: false
+IO.print(-0 < 0) // expect: false
+IO.print(0 > -0) // expect: false
+IO.print(-0 > 0) // expect: false
+IO.print(0 <= -0) // expect: true
+IO.print(-0 <= 0) // expect: true
+IO.print(0 >= -0) // expect: true
+IO.print(-0 >= 0) // expect: true
 
 // TODO: Wrong type for RHS.
diff --git a/test/number/divide.wren b/test/number/divide.wren
index e4e1c102..fe232ba2 100644
--- a/test/number/divide.wren
+++ b/test/number/divide.wren
@@ -1,5 +1,5 @@
-IO.write(8 / 2)        // expect: 4
-IO.write(12.34 / -0.4) // expect: -30.85
+IO.print(8 / 2)        // expect: 4
+IO.print(12.34 / -0.4) // expect: -30.85
 
 // TODO: Unsupported RHS types.
 // TODO: Divide by zero.
diff --git a/test/number/equality.wren b/test/number/equality.wren
index 6682ddb4..9b777037 100644
--- a/test/number/equality.wren
+++ b/test/number/equality.wren
@@ -1,19 +1,19 @@
-IO.write(123 == 123)  // expect: true
-IO.write(123 == 124)  // expect: false
-IO.write(-3 == 3)     // expect: false
-IO.write(0 == -0)     // expect: true
+IO.print(123 == 123)  // expect: true
+IO.print(123 == 124)  // expect: false
+IO.print(-3 == 3)     // expect: false
+IO.print(0 == -0)     // expect: true
 
 // Not equal to other types.
-IO.write(123 == "123") // expect: false
-IO.write(1 == true)    // expect: false
-IO.write(0 == false)   // expect: false
+IO.print(123 == "123") // expect: false
+IO.print(1 == true)    // expect: false
+IO.print(0 == false)   // expect: false
 
-IO.write(123 != 123)  // expect: false
-IO.write(123 != 124)  // expect: true
-IO.write(-3 != 3)     // expect: true
-IO.write(0 != -0)     // expect: false
+IO.print(123 != 123)  // expect: false
+IO.print(123 != 124)  // expect: true
+IO.print(-3 != 3)     // expect: true
+IO.print(0 != -0)     // expect: false
 
 // Not equal to other types.
-IO.write(123 != "123") // expect: true
-IO.write(1 != true)    // expect: true
-IO.write(0 != false)   // expect: true
+IO.print(123 != "123") // expect: true
+IO.print(1 != true)    // expect: true
+IO.print(0 != false)   // expect: true
diff --git a/test/number/literals.wren b/test/number/literals.wren
index 54ff92ea..30899dd0 100644
--- a/test/number/literals.wren
+++ b/test/number/literals.wren
@@ -1,10 +1,10 @@
-IO.write(123)     // expect: 123
-IO.write(987654)  // expect: 987654
-IO.write(0)       // expect: 0
-IO.write(-0)      // expect: -0
+IO.print(123)     // expect: 123
+IO.print(987654)  // expect: 987654
+IO.print(0)       // expect: 0
+IO.print(-0)      // expect: -0
 
-IO.write(123.456) // expect: 123.456
-IO.write(-0.001)  // expect: -0.001
+IO.print(123.456) // expect: 123.456
+IO.print(-0.001)  // expect: -0.001
 
 // TODO: Hex? Scientific notation?
 // TODO: Literals at and beyond numeric limits.
diff --git a/test/number/minus.wren b/test/number/minus.wren
index a04e3714..b02f7b59 100644
--- a/test/number/minus.wren
+++ b/test/number/minus.wren
@@ -1,10 +1,10 @@
 // Infix.
-IO.write(5 - 3)      // expect: 2
-IO.write(3.1 - 0.24) // expect: 2.86
-IO.write(3 - 2 - 1)  // expect: 0
+IO.print(5 - 3)      // expect: 2
+IO.print(3.1 - 0.24) // expect: 2.86
+IO.print(3 - 2 - 1)  // expect: 0
 
 // Unary negation.
 var a = 3
-IO.write(-a) // expect: -3
+IO.print(-a) // expect: -3
 
 // TODO: Unsupported RHS types.
diff --git a/test/number/mod.wren b/test/number/mod.wren
index 7078e72a..29f1e06c 100644
--- a/test/number/mod.wren
+++ b/test/number/mod.wren
@@ -1,14 +1,14 @@
-IO.write(5 % 3) // expect: 2
-IO.write(10 % 5) // expect: 0
-IO.write(-4 % 3) // expect: -1
-IO.write(4 % -3) // expect: 1
-IO.write(-4 % -3) // expect: -1
-IO.write(-4.2 % 3.1) // expect: -1.1
-IO.write(4.2 % -3.1) // expect: 1.1
-IO.write(-4.2 % -3.1) // expect: -1.1
+IO.print(5 % 3) // expect: 2
+IO.print(10 % 5) // expect: 0
+IO.print(-4 % 3) // expect: -1
+IO.print(4 % -3) // expect: 1
+IO.print(-4 % -3) // expect: -1
+IO.print(-4.2 % 3.1) // expect: -1.1
+IO.print(4.2 % -3.1) // expect: 1.1
+IO.print(-4.2 % -3.1) // expect: -1.1
 
 // Left associative.
-IO.write(13 % 7 % 4) // expect: 2
+IO.print(13 % 7 % 4) // expect: 2
 
 // TODO: Unsupported RHS types.
 // TODO: Error on mod by zero.
diff --git a/test/number/multiply.wren b/test/number/multiply.wren
index 04e527bd..40cc4639 100644
--- a/test/number/multiply.wren
+++ b/test/number/multiply.wren
@@ -1,4 +1,4 @@
-IO.write(5 * 3) // expect: 15
-IO.write(12.34 * 0.3) // expect: 3.702
+IO.print(5 * 3) // expect: 15
+IO.print(12.34 * 0.3) // expect: 3.702
 
 // TODO: Unsupported RHS types.
diff --git a/test/number/plus.wren b/test/number/plus.wren
index 4eb177de..d8e37541 100644
--- a/test/number/plus.wren
+++ b/test/number/plus.wren
@@ -1,5 +1,5 @@
-IO.write(1 + 2) // expect: 3
-IO.write(12.34 + 0.13) // expect: 12.47
-IO.write(3 + 5 + 2) // expect: 10
+IO.print(1 + 2) // expect: 3
+IO.print(12.34 + 0.13) // expect: 12.47
+IO.print(3 + 5 + 2) // expect: 10
 
 // TODO: Unsupported RHS types.
diff --git a/test/number/range.wren b/test/number/range.wren
index c7b98c72..3bd27082 100644
--- a/test/number/range.wren
+++ b/test/number/range.wren
@@ -1,12 +1,12 @@
 var inclusive = 2..5
-IO.write(inclusive is Range) // expect: true
-IO.write(inclusive.min) // expect: 2
-IO.write(inclusive.max) // expect: 5
+IO.print(inclusive is Range) // expect: true
+IO.print(inclusive.min) // expect: 2
+IO.print(inclusive.max) // expect: 5
 
 var exclusive = 2...5
-IO.write(exclusive is Range) // expect: true
-IO.write(exclusive.min) // expect: 2
-IO.write(exclusive.max) // expect: 4
+IO.print(exclusive is Range) // expect: true
+IO.print(exclusive.min) // expect: 2
+IO.print(exclusive.max) // expect: 4
 
 // TODO: Non-number RHS.
 // TODO: Non-integer RHS.
diff --git a/test/number/to_string.wren b/test/number/to_string.wren
index 8565945a..b02ca7e2 100644
--- a/test/number/to_string.wren
+++ b/test/number/to_string.wren
@@ -1,5 +1,5 @@
-IO.write(123.toString == "123") // expect: true
-IO.write(-123.toString == "-123") // expect: true
-IO.write(-0.toString == "-0") // expect: true
-IO.write(12.34.toString == "12.34") // expect: true
-IO.write(-0.0001.toString == "-0.0001") // expect: true
+IO.print(123.toString == "123") // expect: true
+IO.print(-123.toString == "-123") // expect: true
+IO.print(-0.toString == "-0") // expect: true
+IO.print(12.34.toString == "12.34") // expect: true
+IO.print(-0.0001.toString == "-0.0001") // expect: true
diff --git a/test/number/type.wren b/test/number/type.wren
index 3cf32a1b..bf7a65a8 100644
--- a/test/number/type.wren
+++ b/test/number/type.wren
@@ -1,4 +1,4 @@
-IO.write(123 is Num)      // expect: true
-IO.write(123 is Object)   // expect: true
-IO.write(123 is String)   // expect: false
-IO.write(123.type == Num) // expect: true
+IO.print(123 is Num)      // expect: true
+IO.print(123 is Object)   // expect: true
+IO.print(123 is String)   // expect: false
+IO.print(123.type == Num) // expect: true
diff --git a/test/object/to_string.wren b/test/object/to_string.wren
index 7b31acc5..f1b09165 100644
--- a/test/object/to_string.wren
+++ b/test/object/to_string.wren
@@ -1,2 +1,2 @@
 class Foo {}
-IO.write((new Foo).toString) // expect: <object>
+IO.print((new Foo).toString) // expect: <object>
diff --git a/test/or.wren b/test/or.wren
index 5754da4c..c35a4c9d 100644
--- a/test/or.wren
+++ b/test/or.wren
@@ -1,26 +1,26 @@
 // Note: These tests implicitly depend on ints being truthy.
-//       Also rely on IO.write() returning its argument.
+//       Also rely on IO.print() returning its argument.
 
 // Return the first true argument.
-IO.write(1 || true) // expect: 1
-IO.write(false || 1) // expect: 1
-IO.write(false || false || true) // expect: true
+IO.print(1 || true) // expect: 1
+IO.print(false || 1) // expect: 1
+IO.print(false || false || true) // expect: true
 
 // Return the last argument if all are false.
-IO.write(false || false) // expect: false
-IO.write(false || false || false) // expect: false
+IO.print(false || false) // expect: false
+IO.print(false || false || false) // expect: false
 
 // Short-circuit at the first true argument.
-IO.write(false) || // expect: false
-    IO.write(true) || // expect: true
-    IO.write(true) // should not print
+IO.print(false) || // expect: false
+    IO.print(true) || // expect: true
+    IO.print(true) // should not print
 
 // Swallow a trailing newline.
-IO.write(true ||
+IO.print(true ||
     true) // expect: true
 
 // Only false is falsy.
-IO.write(0 || true) // expect: 0
-IO.write(null || true) // expect: null
-IO.write(("" || true) == "") // expect: true
-IO.write(false || true) // expect: true
+IO.print(0 || true) // expect: 0
+IO.print(null || true) // expect: null
+IO.print(("" || true) == "") // expect: true
+IO.print(false || true) // expect: true
diff --git a/test/return/after_else.wren b/test/return/after_else.wren
index 0a9f9ab4..8ae87fcd 100644
--- a/test/return/after_else.wren
+++ b/test/return/after_else.wren
@@ -1,3 +1,3 @@
-IO.write(fn {
+IO.print(fn {
   if (false) "no" else return "ok"
 }.call) // expect: ok
diff --git a/test/return/after_if.wren b/test/return/after_if.wren
index 54ee64ef..d1499331 100644
--- a/test/return/after_if.wren
+++ b/test/return/after_if.wren
@@ -1,3 +1,3 @@
-IO.write(fn {
+IO.print(fn {
   if (true) return "ok"
 }.call) // expect: ok
diff --git a/test/return/after_while.wren b/test/return/after_while.wren
index 6f77af20..ad5446f0 100644
--- a/test/return/after_while.wren
+++ b/test/return/after_while.wren
@@ -1,3 +1,3 @@
-IO.write(fn {
+IO.print(fn {
   while (true) return "ok"
 }.call) // expect: ok
diff --git a/test/return/in_function.wren b/test/return/in_function.wren
index e36b14bc..0b1a26af 100644
--- a/test/return/in_function.wren
+++ b/test/return/in_function.wren
@@ -1 +1 @@
-var a = "ok"; IO.write(a) // expect: ok
+var a = "ok"; IO.print(a) // expect: ok
diff --git a/test/return/in_method.wren b/test/return/in_method.wren
index 467fc403..6e68dde4 100644
--- a/test/return/in_method.wren
+++ b/test/return/in_method.wren
@@ -1,8 +1,8 @@
 class Foo {
   method {
     return "ok"
-    IO.write("bad")
+    IO.print("bad")
   }
 }
 
-IO.write((new Foo).method) // expect: ok
+IO.print((new Foo).method) // expect: ok
diff --git a/test/semicolon.wren b/test/semicolon.wren
index e36b14bc..0b1a26af 100644
--- a/test/semicolon.wren
+++ b/test/semicolon.wren
@@ -1 +1 @@
-var a = "ok"; IO.write(a) // expect: ok
+var a = "ok"; IO.print(a) // expect: ok
diff --git a/test/setter/associativity.wren b/test/setter/associativity.wren
index 15096131..efc1d7ab 100644
--- a/test/setter/associativity.wren
+++ b/test/setter/associativity.wren
@@ -13,6 +13,6 @@ var c = new Foo("c")
 
 // Assignment is right-associative.
 a.bar = b.bar = c.bar = "d"
-IO.write(a.toString) // expect: d
-IO.write(b.toString) // expect: d
-IO.write(c.toString) // expect: d
+IO.print(a.toString) // expect: d
+IO.print(b.toString) // expect: d
+IO.print(c.toString) // expect: d
diff --git a/test/setter/instance.wren b/test/setter/instance.wren
index 7ac56b8c..d61254d7 100644
--- a/test/setter/instance.wren
+++ b/test/setter/instance.wren
@@ -1,6 +1,6 @@
 class Foo {
   bar = value {
-    IO.write(value)
+    IO.print(value)
   }
 }
 
diff --git a/test/setter/result.wren b/test/setter/result.wren
index dca95ed3..e7351fea 100644
--- a/test/setter/result.wren
+++ b/test/setter/result.wren
@@ -3,4 +3,4 @@ class Foo {
 }
 
 var foo = new Foo
-IO.write(foo.bar = "value") // expect: result
+IO.print(foo.bar = "value") // expect: result
diff --git a/test/setter/same_name_as_method.wren b/test/setter/same_name_as_method.wren
index 6e99ca4b..82814c0b 100644
--- a/test/setter/same_name_as_method.wren
+++ b/test/setter/same_name_as_method.wren
@@ -1,6 +1,6 @@
 class Foo {
-  bar = value { IO.write("set") }
-  bar { IO.write("get") }
+  bar = value { IO.print("set") }
+  bar { IO.print("get") }
 }
 
 var foo = new Foo
diff --git a/test/setter/static.wren b/test/setter/static.wren
index ef2fc6ab..157d8847 100644
--- a/test/setter/static.wren
+++ b/test/setter/static.wren
@@ -1,6 +1,6 @@
 class Foo {
   static bar = value {
-    IO.write(value)
+    IO.print(value)
   }
 }
 
diff --git a/test/string/contains.wren b/test/string/contains.wren
index cc813808..a2f41541 100644
--- a/test/string/contains.wren
+++ b/test/string/contains.wren
@@ -1,6 +1,6 @@
-IO.write("".contains(""))              // expect: true
-IO.write("anything".contains(""))      // expect: true
-IO.write("something".contains("meth")) // expect: true
-IO.write("something".contains("some")) // expect: true
-IO.write("something".contains("ing"))  // expect: true
-IO.write("something".contains("math")) // expect: false
+IO.print("".contains(""))              // expect: true
+IO.print("anything".contains(""))      // expect: true
+IO.print("something".contains("meth")) // expect: true
+IO.print("something".contains("some")) // expect: true
+IO.print("something".contains("ing"))  // expect: true
+IO.print("something".contains("math")) // expect: false
diff --git a/test/string/count.wren b/test/string/count.wren
index 6dfbedd1..d7af9f3b 100644
--- a/test/string/count.wren
+++ b/test/string/count.wren
@@ -1,2 +1,2 @@
-IO.write("".count)   // expect: 0
-IO.write("a string".count) // expect: 8
+IO.print("".count)   // expect: 0
+IO.print("a string".count) // expect: 8
diff --git a/test/string/equality.wren b/test/string/equality.wren
index f0206cb9..23dd3f06 100644
--- a/test/string/equality.wren
+++ b/test/string/equality.wren
@@ -1,19 +1,19 @@
-IO.write("" == "")          // expect: true
-IO.write("abcd" == "abcd")  // expect: true
-IO.write("abcd" == "d")     // expect: false
-IO.write("e" == "abcd")     // expect: false
-IO.write("" == "abcd")      // expect: false
+IO.print("" == "")          // expect: true
+IO.print("abcd" == "abcd")  // expect: true
+IO.print("abcd" == "d")     // expect: false
+IO.print("e" == "abcd")     // expect: false
+IO.print("" == "abcd")      // expect: false
 
 // Not equal to other types.
-IO.write("1" == 1)        // expect: false
-IO.write("true" == true)  // expect: false
+IO.print("1" == 1)        // expect: false
+IO.print("true" == true)  // expect: false
 
-IO.write("" != "")          // expect: false
-IO.write("abcd" != "abcd")  // expect: false
-IO.write("abcd" != "d")     // expect: true
-IO.write("e" != "abcd")     // expect: true
-IO.write("" != "abcd")      // expect: true
+IO.print("" != "")          // expect: false
+IO.print("abcd" != "abcd")  // expect: false
+IO.print("abcd" != "d")     // expect: true
+IO.print("e" != "abcd")     // expect: true
+IO.print("" != "abcd")      // expect: true
 
 // Not equal to other types.
-IO.write("1" != 1)        // expect: true
-IO.write("true" != true)  // expect: true
+IO.print("1" != 1)        // expect: true
+IO.print("true" != true)  // expect: true
diff --git a/test/string/escapes.wren b/test/string/escapes.wren
index dccf87ad..eaf5ab75 100644
--- a/test/string/escapes.wren
+++ b/test/string/escapes.wren
@@ -1,8 +1,7 @@
 // Escape characters.
-IO.write("\"")     // expect: "
-IO.write("\\")     // expect: \
-IO.write("(\n)")   // expect: (
+IO.print("\"")     // expect: "
+IO.print("\\")     // expect: \
+IO.print("(\n)")   // expect: (
                    // expect: )
 
 // TODO: Non-printing escapes like \t.
-// TODO: Unicode escape sequences.
diff --git a/test/string/literals.wren b/test/string/literals.wren
index ac20b7ce..18a6e995 100644
--- a/test/string/literals.wren
+++ b/test/string/literals.wren
@@ -1,2 +1,2 @@
-IO.write("".count)   // expect: 0
-IO.write("a string") // expect: a string
+IO.print("".count)   // expect: 0
+IO.print("a string") // expect: a string
diff --git a/test/string/subscript.wren b/test/string/subscript.wren
index c1cba0d4..658cbfe5 100644
--- a/test/string/subscript.wren
+++ b/test/string/subscript.wren
@@ -1,11 +1,11 @@
 // Returns characters (as strings).
-IO.write("abcd"[0]) // expect: a
-IO.write("abcd"[1]) // expect: b
-IO.write("abcd"[2]) // expect: c
-IO.write("abcd"[3]) // expect: d
+IO.print("abcd"[0]) // expect: a
+IO.print("abcd"[1]) // expect: b
+IO.print("abcd"[2]) // expect: c
+IO.print("abcd"[3]) // expect: d
 
 // Allows indexing backwards from the end.
-IO.write("abcd"[-4]) // expect: a
-IO.write("abcd"[-3]) // expect: b
-IO.write("abcd"[-2]) // expect: c
-IO.write("abcd"[-1]) // expect: d
+IO.print("abcd"[-4]) // expect: a
+IO.print("abcd"[-3]) // expect: b
+IO.print("abcd"[-2]) // expect: c
+IO.print("abcd"[-1]) // expect: d
diff --git a/test/string/to_string.wren b/test/string/to_string.wren
index cf203b46..c7f11fd0 100644
--- a/test/string/to_string.wren
+++ b/test/string/to_string.wren
@@ -1,2 +1,2 @@
-IO.write("".toString == "") // expect: true
-IO.write("blah".toString == "blah") // expect: true
+IO.print("".toString == "") // expect: true
+IO.print("blah".toString == "blah") // expect: true
diff --git a/test/string/type.wren b/test/string/type.wren
index ecf2f130..9af9bdf1 100644
--- a/test/string/type.wren
+++ b/test/string/type.wren
@@ -1,4 +1,4 @@
-IO.write("s" is String)      // expect: true
-IO.write("s" is Object)      // expect: true
-IO.write("s" is Num)         // expect: false
-IO.write("s".type == String) // expect: true
+IO.print("s" is String)      // expect: true
+IO.print("s" is Object)      // expect: true
+IO.print("s" is Num)         // expect: false
+IO.print("s".type == String) // expect: true
diff --git a/test/string/unicode_escapes.wren b/test/string/unicode_escapes.wren
new file mode 100644
index 00000000..aa8b7780
--- /dev/null
+++ b/test/string/unicode_escapes.wren
@@ -0,0 +1,18 @@
+// One byte UTF-8 Sequences.
+IO.print("\u0041")     // expect: A
+IO.print("\u007e")     // expect: ~
+
+// Two byte sequences.
+IO.print("\u00b6")     // expect: ¶
+IO.print("\u00de")     // expect: Þ
+
+// Three byte sequences.
+IO.print("\u0950")     // expect: ॐ
+IO.print("\u0b83")     // expect: ஃ
+
+// Capitalized hex.
+IO.print("\u00B6")     // expect: ¶
+IO.print("\u00DE")     // expect: Þ
+
+// TODO: Missing digits in escape.
+// TODO: Syntax for Unicode escapes > 0xffff?
diff --git a/test/super/call_other_method.wren b/test/super/call_other_method.wren
index c10725cc..49fe2b12 100644
--- a/test/super/call_other_method.wren
+++ b/test/super/call_other_method.wren
@@ -1,12 +1,12 @@
 class Base {
   foo {
-    IO.write("Base.foo")
+    IO.print("Base.foo")
   }
 }
 
 class Derived is Base {
   bar {
-    IO.write("Derived.bar")
+    IO.print("Derived.bar")
     super.foo
   }
 }
diff --git a/test/super/call_same_method.wren b/test/super/call_same_method.wren
index 68621006..b9d162fe 100644
--- a/test/super/call_same_method.wren
+++ b/test/super/call_same_method.wren
@@ -1,12 +1,12 @@
 class Base {
   foo {
-    IO.write("Base.foo")
+    IO.print("Base.foo")
   }
 }
 
 class Derived is Base {
   foo {
-    IO.write("Derived.foo")
+    IO.print("Derived.foo")
     super.foo
   }
 }
diff --git a/test/super/closure.wren b/test/super/closure.wren
index fbfb1ccf..7c95a5ea 100644
--- a/test/super/closure.wren
+++ b/test/super/closure.wren
@@ -13,4 +13,4 @@ class Derived is Base {
 }
 
 var closure = (new Derived).getClosure
-IO.write(closure.call) // expect: Base
+IO.print(closure.call) // expect: Base
diff --git a/test/super/indirectly_inherited.wren b/test/super/indirectly_inherited.wren
index 655739a0..78407fc1 100644
--- a/test/super/indirectly_inherited.wren
+++ b/test/super/indirectly_inherited.wren
@@ -1,6 +1,6 @@
 class A {
   foo {
-    IO.write("A.foo")
+    IO.print("A.foo")
   }
 }
 
@@ -8,7 +8,7 @@ class B is A {}
 
 class C is B {
   foo {
-    IO.write("C.foo")
+    IO.print("C.foo")
     super.foo
   }
 }
diff --git a/test/this/closure.wren b/test/this/closure.wren
index f5e40cce..013a8b42 100644
--- a/test/this/closure.wren
+++ b/test/this/closure.wren
@@ -9,4 +9,4 @@ class Foo {
 }
 
 var closure = (new Foo).getClosure
-IO.write(closure.call) // expect: Foo
+IO.print(closure.call) // expect: Foo
diff --git a/test/this/nested_class.wren b/test/this/nested_class.wren
index 6bf50f3d..f6abeff0 100644
--- a/test/this/nested_class.wren
+++ b/test/this/nested_class.wren
@@ -1,13 +1,13 @@
 class Outer {
   method {
-    IO.write(this.toString) // expect: Outer
+    IO.print(this.toString) // expect: Outer
 
     fn {
-      IO.write(this.toString) // expect: Outer
+      IO.print(this.toString) // expect: Outer
 
       class Inner {
         method {
-          IO.write(this.toString) // expect: Inner
+          IO.print(this.toString) // expect: Inner
         }
         toString { return "Inner" }
       }
diff --git a/test/this/nested_closure.wren b/test/this/nested_closure.wren
index b5586857..10b22fe6 100644
--- a/test/this/nested_closure.wren
+++ b/test/this/nested_closure.wren
@@ -13,4 +13,4 @@ class Foo {
 }
 
 var closure = (new Foo).getClosure
-IO.write(closure.call.call.call) // expect: Foo
+IO.print(closure.call.call.call) // expect: Foo
diff --git a/test/this/this_in_method.wren b/test/this/this_in_method.wren
index cc947a50..53339ff2 100644
--- a/test/this/this_in_method.wren
+++ b/test/this/this_in_method.wren
@@ -3,4 +3,4 @@ class Foo {
   baz { return "baz" }
 }
 
-IO.write((new Foo).bar.baz) // expect: baz
+IO.print((new Foo).bar.baz) // expect: baz
diff --git a/test/unexpected_character.wren b/test/unexpected_character.wren
index 9d6f57f6..49b486c2 100644
--- a/test/unexpected_character.wren
+++ b/test/unexpected_character.wren
@@ -1,3 +1,3 @@
-IO.write("no")
+IO.print("no")
 // Something that's not a valid character:
 ^ // expect error
diff --git a/test/variable/global_in_initializer.wren b/test/variable/global_in_initializer.wren
index 2e92b719..c1fe9e1c 100644
--- a/test/variable/global_in_initializer.wren
+++ b/test/variable/global_in_initializer.wren
@@ -1,2 +1,2 @@
 var a = a == null
-IO.write(a) // expect: true
+IO.print(a) // expect: true
diff --git a/test/variable/global_without_initializer.wren b/test/variable/global_without_initializer.wren
index c63a2769..e934ae7e 100644
--- a/test/variable/global_without_initializer.wren
+++ b/test/variable/global_without_initializer.wren
@@ -1,2 +1,2 @@
 var a
-IO.write(a) // expect: null
+IO.print(a) // expect: null
diff --git a/test/variable/local_in_initializer.wren b/test/variable/local_in_initializer.wren
index cb56de89..2453a157 100644
--- a/test/variable/local_in_initializer.wren
+++ b/test/variable/local_in_initializer.wren
@@ -1,5 +1,5 @@
 // skip: Variables should not be in scope in their initializer.
 {
   var a = a + 1 // expect error
-  IO.write(a)
+  IO.print(a)
 }
diff --git a/test/variable/local_in_middle_of_block.wren b/test/variable/local_in_middle_of_block.wren
index 621e243d..803bdcd4 100644
--- a/test/variable/local_in_middle_of_block.wren
+++ b/test/variable/local_in_middle_of_block.wren
@@ -1,13 +1,13 @@
 class Foo {
   bar {
     var a = "a"
-    IO.write(a) // expect: a
+    IO.print(a) // expect: a
     var b = a + " b"
-    IO.write(b) // expect: a b
+    IO.print(b) // expect: a b
     var c = a + " c"
-    IO.write(c) // expect: a c
+    IO.print(c) // expect: a c
     var d = b + " d"
-    IO.write(d) // expect: a b d
+    IO.print(d) // expect: a b d
   }
 }
 
diff --git a/test/variable/local_in_nested_block.wren b/test/variable/local_in_nested_block.wren
index 0415b86a..11a82485 100644
--- a/test/variable/local_in_nested_block.wren
+++ b/test/variable/local_in_nested_block.wren
@@ -1,6 +1,6 @@
 {
   var a = "outer"
   {
-    IO.write(a) // expect: outer
+    IO.print(a) // expect: outer
   }
 }
\ No newline at end of file
diff --git a/test/variable/local_without_initializer.wren b/test/variable/local_without_initializer.wren
index 02a624d1..2daea492 100644
--- a/test/variable/local_without_initializer.wren
+++ b/test/variable/local_without_initializer.wren
@@ -1,4 +1,4 @@
 {
   var a
-  IO.write(a) // expect: null
+  IO.print(a) // expect: null
 }
diff --git a/test/variable/many_locals.wren b/test/variable/many_locals.wren
index 1fe7fa2d..d8ab0a5d 100644
--- a/test/variable/many_locals.wren
+++ b/test/variable/many_locals.wren
@@ -255,5 +255,5 @@
   var a253 = a252
   var a254 = a253
   var a255 = a254
-  IO.write(a255) // expect: value
+  IO.print(a255) // expect: value
 }
diff --git a/test/variable/many_nonsimultaneous_locals.wren b/test/variable/many_nonsimultaneous_locals.wren
index 6c7f62c1..2d81fd37 100644
--- a/test/variable/many_nonsimultaneous_locals.wren
+++ b/test/variable/many_nonsimultaneous_locals.wren
@@ -259,7 +259,7 @@
     var a253 = a252
     var a254 = a253
     var a255 = a254
-    IO.write(a255) // expect: value a
+    IO.print(a255) // expect: value a
   }
 
   {
@@ -519,6 +519,6 @@
     var b253 = b252
     var b254 = b253
     var b255 = b254
-    IO.write(b255) // expect: value b
+    IO.print(b255) // expect: value b
   }
 }
diff --git a/test/variable/scope_if.wren b/test/variable/scope_if.wren
index a2246b24..6fc8a225 100644
--- a/test/variable/scope_if.wren
+++ b/test/variable/scope_if.wren
@@ -3,11 +3,11 @@ var a = "out"
 if (true) {
   var a = "in"
 }
-IO.write(a) // expect: out
+IO.print(a) // expect: out
 
 // Create a local scope for the 'else' expression.
 var b = "out"
 if (false) "dummy" else {
   var b = "in"
 }
-IO.write(b) // expect: out
+IO.print(b) // expect: out
diff --git a/test/variable/scope_reuse_in_different_blocks.wren b/test/variable/scope_reuse_in_different_blocks.wren
index ad0987c8..92796bab 100644
--- a/test/variable/scope_reuse_in_different_blocks.wren
+++ b/test/variable/scope_reuse_in_different_blocks.wren
@@ -1,9 +1,9 @@
 {
   var a = "first"
-  IO.write(a) // expect: first
+  IO.print(a) // expect: first
 }
 
 {
   var a = "second"
-  IO.write(a) // expect: second
+  IO.print(a) // expect: second
 }
diff --git a/test/variable/scope_while.wren b/test/variable/scope_while.wren
index 96c15cf1..d8e215b5 100644
--- a/test/variable/scope_while.wren
+++ b/test/variable/scope_while.wren
@@ -4,4 +4,4 @@ var i = 0
 while ((i = i + 1) <= 1) {
   var a = "inner"
 }
-IO.write(a) // expect: outer
+IO.print(a) // expect: outer
diff --git a/test/variable/shadow_and_local.wren b/test/variable/shadow_and_local.wren
index 93aa7f23..e069a0bf 100644
--- a/test/variable/shadow_and_local.wren
+++ b/test/variable/shadow_and_local.wren
@@ -1,8 +1,8 @@
 {
   var a = "outer"
   {
-    IO.write(a) // expect: outer
+    IO.print(a) // expect: outer
     var a = "inner"
-    IO.write(a) // expect: inner
+    IO.print(a) // expect: inner
   }
 }
\ No newline at end of file
diff --git a/test/variable/shadow_global.wren b/test/variable/shadow_global.wren
index 668e87f8..8f86f37d 100644
--- a/test/variable/shadow_global.wren
+++ b/test/variable/shadow_global.wren
@@ -1,6 +1,6 @@
 var a = "global"
 {
   var a = "shadow"
-  IO.write(a) // expect: shadow
+  IO.print(a) // expect: shadow
 }
-IO.write(a) // expect: global
\ No newline at end of file
+IO.print(a) // expect: global
\ No newline at end of file
diff --git a/test/variable/shadow_in_initializer.wren b/test/variable/shadow_in_initializer.wren
index 36a8be41..db2e50ba 100644
--- a/test/variable/shadow_in_initializer.wren
+++ b/test/variable/shadow_in_initializer.wren
@@ -3,6 +3,6 @@
   var a = "outer"
   {
     var a = a + " inner"
-    IO.write(a) // expect: outer inner
+    IO.print(a) // expect: outer inner
   }
 }
diff --git a/test/variable/shadow_local.wren b/test/variable/shadow_local.wren
index 41bdbca0..8234a5c4 100644
--- a/test/variable/shadow_local.wren
+++ b/test/variable/shadow_local.wren
@@ -2,7 +2,7 @@
   var a = "local"
   {
     var a = "shadow"
-    IO.write(a) // expect: shadow
+    IO.print(a) // expect: shadow
   }
-  IO.write(a) // expect: local
+  IO.print(a) // expect: local
 }
\ No newline at end of file
diff --git a/test/variable/undefined_global.wren b/test/variable/undefined_global.wren
index 318b1492..196b010b 100644
--- a/test/variable/undefined_global.wren
+++ b/test/variable/undefined_global.wren
@@ -1 +1 @@
-IO.write(notDefined)  // expect error
+IO.print(notDefined)  // expect error
diff --git a/test/variable/undefined_local.wren b/test/variable/undefined_local.wren
index 87254284..8597c80f 100644
--- a/test/variable/undefined_local.wren
+++ b/test/variable/undefined_local.wren
@@ -1,3 +1,3 @@
 fn {
-  IO.write(notDefined)  // expect error
+  IO.print(notDefined)  // expect error
 }.call
diff --git a/test/while/closure_in_body.wren b/test/while/closure_in_body.wren
index 1a61641f..ef6bbca1 100644
--- a/test/while/closure_in_body.wren
+++ b/test/while/closure_in_body.wren
@@ -3,7 +3,7 @@ var list = []
 var i = 1
 while (i < 4) {
   var j = i + 1
-  list.add(fn IO.write(j))
+  list.add(fn IO.print(j))
   i = i + 1
 }
 
diff --git a/test/while/syntax.wren b/test/while/syntax.wren
index 7138239a..f5dfb361 100644
--- a/test/while/syntax.wren
+++ b/test/while/syntax.wren
@@ -1,6 +1,6 @@
 // Single-expression body.
 var c = 0
-while (c < 3) IO.write(c = c + 1)
+while (c < 3) IO.print(c = c + 1)
 // expect: 1
 // expect: 2
 // expect: 3
@@ -8,7 +8,7 @@ while (c < 3) IO.write(c = c + 1)
 // Block body.
 var a = 0
 while (a < 3) {
-  IO.write(a)
+  IO.print(a)
   a = a + 1
 }
 // expect: 0
@@ -18,7 +18,7 @@ while (a < 3) {
 // Newline after "while".
 var d = 0
 while
-(d < 3) IO.write(d = d + 1)
+(d < 3) IO.print(d = d + 1)
 // expect: 1
 // expect: 2
 // expect: 3