initial sync*, part of #221

lib/runtime/dart/collection.js

 dart_library.library('dart/collection', null, /* Imports */[
   "dart_runtime/dart",
   'dart/core'
 ], /* Lazy imports */[
   'dart/_internal',
   'dart/_js_helper',
   'dart/math'
 ], function(exports, dart, core, _internal, _js_helper, math) {
   'use strict';
   let dartx = dart.dartx;
@@ skipping 3612 matching lines @@
       }
       clear() {
         this[_clear]();
       }
       containsKey(key) {
         return dart.notNull(this[_validKey](key)) && this[_splay](dart.as(key, K)) == 0;
       }
       containsValue(value) {
         let found = false;
         let initialSplayCount = this[_splayCount];
-        let visit = node => {
+        let visit = (function(node) {
           while (node != null) {
             if (dart.equals(node.value, value))
               return true;
             if (initialSplayCount != this[_splayCount]) {
               throw new core.ConcurrentModificationError(this);
             }
             if (node.right != null && dart.notNull(visit(dart.as(node.right, _SplayTreeMapNode))))
               return true;
             node = dart.as(node.left, _SplayTreeMapNode);
           }
           return false;
-        };
+        }).bind(this);
         dart.fn(visit, core.bool, [_SplayTreeMapNode]);
         return visit(dart.as(this[_root], _SplayTreeMapNode));
       }
       get keys() {
         return new (_SplayTreeKeyIterable$(K))(this);
       }
       get values() {
         return new (_SplayTreeValueIterable$(K, V))(this);
       }
       toString() {
@@ skipping 2364 matching lines @@
   exports.LinkedHashMapKeyIterable$ = LinkedHashMapKeyIterable$;
   exports.LinkedHashMapKeyIterable = LinkedHashMapKeyIterable;
   exports.LinkedHashMapKeyIterator$ = LinkedHashMapKeyIterator$;
   exports.LinkedHashMapKeyIterator = LinkedHashMapKeyIterator;
   exports.HashSetIterator$ = HashSetIterator$;
   exports.HashSetIterator = HashSetIterator;
   exports.LinkedHashSetCell = LinkedHashSetCell;
   exports.LinkedHashSetIterator$ = LinkedHashSetIterator$;
   exports.LinkedHashSetIterator = LinkedHashSetIterator;
 });