Handle empty (or comment-only) files. Fix #57.

src/main.c

@@ -90,12 +90,8 @@ static int runRepl(WrenVM* vm)
       return 0;
     }
 
-    // Do nothing if we received an empty line.
-    if (strcmp(line, "\n") != 0)
-    {
-      // TODO: Handle failure.
-      wrenInterpret(vm, "Prompt", line);
-    }
+    // TODO: Handle failure.
+    wrenInterpret(vm, "Prompt", line);
 
     free(line);
 

src/wren_compiler.c

@@ -2747,7 +2747,7 @@ ObjFn* wrenCompile(WrenVM* vm, const char* sourcePath, const char* source)
 
   WREN_UNPIN(vm);
 
-  for (;;)
+  while (!match(&compiler, TOKEN_EOF))
   {
     definition(&compiler);
 
@@ -2757,8 +2757,6 @@ ObjFn* wrenCompile(WrenVM* vm, const char* sourcePath, const char* source)
       consume(&compiler, TOKEN_EOF, "Expect end of file.");
       break;
     }
-
-    if (match(&compiler, TOKEN_EOF)) break;
   }
 
   emit(&compiler, CODE_NULL);

test/comments/only_line_comment.wren

@@ -0,0 +1 @@
+// comment

test/comments/only_line_comment_and_line.wren

@@ -0,0 +1 @@
+// comment