Add some support for the code-point code-unit distinction.

sdk/lib/_internal/compiler/implementation/tree/dartstring.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of tree;
 
 /**
  * The [DartString] type represents a Dart string value as a sequence of Unicode
  * Scalar Values.
  * After parsing, any valid [LiteralString] will contain a [DartString]
@@ skipping 81 matching lines @@
   EscapedSourceDartString(source, length) : super(source, length);
   Iterator<int> iterator() {
     if (toStringCache != null) return new StringCodeIterator(toStringCache);
     return new StringEscapeIterator(source);
   }
   String slowToString() {
     if (toStringCache != null) return toStringCache;
     StringBuffer buffer = new StringBuffer();
     StringEscapeIterator it = new StringEscapeIterator(source);
     while (it.hasNext) {
-      buffer.addCharCode(it.next());
+      int code = it.next();

[floitsch, 2012/11/08 15:28:21]

leave as is?

[erikcorry, 2012/11/15 13:28:25]

Done.

+      buffer.addCharCode(code);
     }
     toStringCache = buffer.toString();
     return toStringCache;
   }
 }
 
 /**
  * The concatenation of two [DartString]s.
  */
 class ConsDartString extends DartString {
@@ skipping 89 matching lines @@
       for (int i = 0; i < 3; i++) {
         code = source.next();
         value = value * 16 + hexDigitValue(code);
       }
       return value;
     }
     return code;
   }
 }