Implement tear-off closure operator #

runtime/lib/symbol_patch.dart

 // Copyright (c) 2013, 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.
 
 patch class Symbol {
   /* patch */ const Symbol(String name)
       : this._name = name;
 
   /* patch */ toString() => 'Symbol("${getUnmangledName(this)}")';
 
   static getUnmangledName(Symbol symbol) {
     String string = Symbol.getName(symbol);
 
+    // Remove closurization hash mark
+    // #foo -> foo
+    if (string.startsWith('#')) {
+      string = string.substring(1);
+    }
     // get:foo -> foo
     // set:foo -> foo=
     // get:_foo@xxx -> _foo
     // set:_foo@xxx -> _foo=
     // Class._constructor@xxx -> Class._constructor
     // _Class@xxx._constructor@xxx -> _Class._constructor
     // lib._S@xxx with lib._M1@xxx, lib._M2@xxx -> lib._S with lib._M1, lib._M2
     StringBuffer result = new StringBuffer();
     bool add_setter_suffix = false;
     var pos = 0;
@@ skipping 16 matching lines @@
       if (!skip) {
         result.write(char);
       }
     }
     if (add_setter_suffix) {
       result.write('=');
     }
     return result.toString();
   }
 }