Avoid mangling the name of native methods.

frog/analyze.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.
 
 /**
  * A simple code analyzer for Dart.
  *
  * Currently used to ensure all concrete generic types are visited.
  * Also performs all static type checks - so these don't need to be
  * done in later phases.
@@ skipping 146 matching lines @@
         // TODO(jimhug): Move this into parser?
         world.error('bare argument cannot follow named arguments', arg.span);
       }
       args.add(visitValue(arg.value));
     }
 
     return new Arguments(arguments, args);
   }
 
   MethodMember _makeLambdaMethod(String name, FunctionDefinition func) {
-    var meth = new MethodMember(name, method.declaringType, func);
-    meth.isLambda = true;
+    var meth = new MethodMember.lambda(name, method.declaringType, func);
     meth.enclosingElement = method;
     meth._methodData = new MethodData(meth, _frame);
     meth.resolve();
     return meth;
   }
 
   void _pushBlock(Node node) {
     _frame.pushBlock(node);
   }
   void _popBlock(Node node) {
@@ skipping 607 matching lines @@
     for (var item in node.pieces) {
       var val = visitValue(item);
       var sval = val.invoke(_frame, 'toString', item, Arguments.EMPTY);
       ret = ret.binop(TokenKind.ADD, sval, _frame, item);
     }
     return _frame._makeValue(world.stringType, node); //???ret;
     */
   }
 }