Avoid syntax errors on oddly named fields.

dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart

Index: dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart b/dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
index 37be935d403a9aff6d503c8ced25b6b4056aee8f..700d687f0d9f70fc13767dc2298cc1a197e8d07e 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
@@ -313,9 +313,10 @@ class CodeEmitterTask extends CompilerTask {
           js.if_('i != 0', js('str += ", "')),
 
           js('var field = fields[i]'),
+          js('var parameter = "parameter" + i'),

[sra1, 2013/05/16 00:09:31]

This would give more readable code when you single-step into the generated
constructor:

"parameter_" + field

[ahe, 2013/05/16 12:41:56]

Great idea. Done.

           js('field = generateAccessor(field, prototype)'),
-          js('str += field'),
-          js('body += ("this." + field + " = " + field + ";\\n")')
+          js('str += parameter'),
+          js('body += ("this." + field + " = " + parameter + ";\\n")')
         ]),
 
         js('str += (") {" + body + "}\\nreturn " + cls)'),