Merge branch 'master' into smarter-imports

# Conflicts:
#	src/module/io.c
#	src/vm/wren_vm.c

test/core/string/trim.wren

@@ -0,0 +1,16 @@
+System.print("".trim() == "") // expect: true
+System.print("foo".trim() == "foo") // expect: true
+System.print(" \t\r\nfoo b\tar \t\r\n".trim() == "foo b\tar") // expect: true
+System.print(" \t\r\n \t\r\n".trim() == "") // expect: true
+System.print(" \n\n\tsøméஃthîng \n\n\t".trim() == "søméஃthîng") // expect: true
+
+System.print("".trim("abc") == "") // expect: true
+System.print("foo".trim("abc") == "foo") // expect: true
+System.print("foo".trim("") == "foo") // expect: true
+System.print("cbacbfoobarab".trim("abc") == "foobar") // expect: true
+System.print("abcbacba".trim("abc") == "") // expect: true
+System.print("søméஃthîngsøméஃ".trim("ஃmésø") == "thîng") // expect: true
+
+// 8-bit clean.
+System.print(" \t\ra\0b \t\r".trim() == "a\0b") // expect: true
+System.print("\0a\0b\0c\0".trim("c\0a") == "b") // expect: true

test/core/string/trim_chars_not_string.wren

@@ -0,0 +1 @@
+"abracadabra".trim(123) // expect runtime error: Characters must be a string.

test/core/string/trim_end.wren

@@ -0,0 +1,16 @@
+System.print("".trimEnd() == "") // expect: true
+System.print("foo".trimEnd() == "foo") // expect: true
+System.print(" \t\r\nfoo b\tar \t\r\n".trimEnd() == " \t\r\nfoo b\tar") // expect: true
+System.print(" \t\r\n \t\r\n".trimEnd() == "") // expect: true
+System.print("søméஃthîng \n\n\t".trimEnd() == "søméஃthîng") // expect: true
+
+System.print("".trimEnd("abc") == "") // expect: true
+System.print("foo".trimEnd("abc") == "foo") // expect: true
+System.print("foo".trimEnd("") == "foo") // expect: true
+System.print("cbacbfoobarab".trimEnd("abc") == "cbacbfoobar") // expect: true
+System.print("abcbacba".trimEnd("abc") == "") // expect: true
+System.print("søméஃthîngsøméஃ".trimEnd("ஃmésø") == "søméஃthîng") // expect: true
+
+// 8-bit clean.
+System.print(" \t\ra\0b \t\r".trimEnd() == " \t\ra\0b") // expect: true
+System.print("\0a\0b\0c\0".trimEnd("c\0") == "\0a\0b") // expect: true

test/core/string/trim_end_chars_not_string.wren

@@ -0,0 +1 @@
+"abracadabra".trimEnd(123) // expect runtime error: Characters must be a string.

test/core/string/trim_start.wren

@@ -0,0 +1,16 @@
+System.print("".trimStart() == "") // expect: true
+System.print("foo".trimStart() == "foo") // expect: true
+System.print(" \t\r\nfoo b\tar \t\r\n".trimStart() == "foo b\tar \t\r\n") // expect: true
+System.print(" \t\r\n \t\r\n".trimStart() == "") // expect: true
+System.print(" \n\n\tsøméஃthîng".trimStart() == "søméஃthîng") // expect: true
+
+System.print("".trimStart("abc") == "") // expect: true
+System.print("foo".trimStart("abc") == "foo") // expect: true
+System.print("foo".trimStart("") == "foo") // expect: true
+System.print("cbacbfoobarab".trimStart("abc") == "foobarab") // expect: true
+System.print("abcbacba".trimStart("abc") == "") // expect: true
+System.print("søméஃthîng".trimStart("ஃmésø") == "thîng") // expect: true
+
+// 8-bit clean.
+System.print(" \t\ra\0b".trimStart() == "a\0b") // expect: true
+System.print("\0a\0b\0c\0".trimStart("a\0") == "b\0c\0") // expect: true

test/core/string/trim_start_chars_not_string.wren

@@ -0,0 +1 @@
+"abracadabra".trimStart(123) // expect runtime error: Characters must be a string.

test/language/bom.wren

@@ -0,0 +1,2 @@
+// This file should have a UTF-8 byte order mark
+System.print("ok") // expect: ok

test/language/variable/many_locals.wren

@@ -1,6 +1,6 @@
 {
-  var a0 = "value"
-  var a1 = a0
+  // Slot zero is always taken to hold the closure or receiver.
+  var a1 = "value"
   var a2 = a1
   var a3 = a2
   var a4 = a3

test/language/variable/many_nonsimultaneous_locals.wren

@@ -1,10 +1,10 @@
-// Can have more than 256 local variables in a local scope, as long as they
+// Can have more than 255 local variables in a local scope, as long as they
 // aren't all in scope at the same time.
 
 {
   {
-    var a0 = "value a"
-    var a1 = a0
+    // Slot zero is always taken to hold the closure or receiver.
+    var a1 = "value a"
     var a2 = a1
     var a3 = a2
     var a4 = a3
@@ -263,8 +263,8 @@
   }
 
   {
-    var b0 = "value b"
-    var b1 = b0
+    // Slot zero is always taken to hold the closure or receiver.
+    var b1 = "value b"
     var b2 = b1
     var b3 = b2
     var b4 = b3

test/language/variable/too_many_locals.wren

@@ -1,6 +1,6 @@
 {
-  var a0 = "value"
-  var a1 = a0
+  // Slot zero is always taken to hold the closure or receiver.
+  var a1 = "value"
   var a2 = a1
   var a3 = a2
   var a4 = a3

test/language/variable/too_many_locals_nested.wren

@@ -1,6 +1,6 @@
 {
-  var a0 = "value"
-  var a1 = a0
+  // Slot zero is always taken to hold the closure or receiver.
+  var a1 = "value"
   var a2 = a1
   var a3 = a2
   var a4 = a3

test/regression/494.wren

@@ -0,0 +1,3 @@
+0[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+// expect error line 1
+// expect error line 4