Start new design for interceptors and implement String.charCodeAt with it.

sdk/lib/_internal/compiler/implementation/compile_time_constants.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 dart2js;
 
 /**
  * The [ConstantHandler] keeps track of compile-time constants,
  * initializations of global and static fields, and default values of
  * optional parameters.
@@ skipping 332 matching lines @@
     Constant constant = new MapConstant(type, keysList, values, protoValue);
     compiler.constantHandler.registerCompileTimeConstant(constant);
     return constant;
   }
 
   Constant visitLiteralNull(LiteralNull node) {
     return constantSystem.createNull();
   }
 
   Constant visitLiteralString(LiteralString node) {
+    compiler.enqueuer.codegen.registerSpecialInstantiatedClass(
+        compiler.jsStringClass);

[ahe, 2012/11/09 13:45:29]

Looks like a good candidate for a small shared method.

[ngeoffray, 2012/11/13 11:45:16]

Done.

     return constantSystem.createString(node.dartString, node);
   }
 
   Constant visitStringJuxtaposition(StringJuxtaposition node) {
     StringConstant left = evaluate(node.first);
     StringConstant right = evaluate(node.second);
     if (left == null || right == null) return null;
+    compiler.enqueuer.codegen.registerSpecialInstantiatedClass(
+        compiler.jsStringClass);
     return constantSystem.createString(
         new DartString.concat(left.value, right.value), node);
   }
 
   Constant visitStringInterpolation(StringInterpolation node) {
     StringConstant initialString = evaluate(node.string);
     if (initialString == null) return null;
+    compiler.enqueuer.codegen.registerSpecialInstantiatedClass(
+        compiler.jsStringClass);
     DartString accumulator = initialString.value;
     for (StringInterpolationPart part in node.parts) {
       Constant expression = evaluate(part.expression);
       DartString expressionString;
       if (expression == null) {
         return signalNotCompileTimeConstant(part.expression);
       } else if (expression.isNum() || expression.isBool()) {
         PrimitiveConstant primitive = expression;
         expressionString = new DartString.literal(primitive.value.toString());
       } else if (expression.isString()) {
@@ skipping 432 matching lines @@
             // Use the default value.
             fieldValue = compiler.compileConstant(field);
           }
           jsNewArguments.add(fieldValue);
         },
         includeBackendMembers: true,
         includeSuperMembers: true);
     return jsNewArguments;
   }
 }