Handle for-in loops

lib/runtime/dart/_js_helper.js

 var _js_helper;
 (function(exports) {
   'use strict';
   class NoSideEffects extends core.Object {
     NoSideEffects() {
     }
   }
   class NoThrows extends core.Object {
     NoThrows() {
     }
@@ skipping 773 matching lines @@
     }
     if (onMatch === null)
       onMatch = _matchString;
     if (onNonMatch === null)
       onNonMatch = _stringIdentity;
     if (typeof pattern == 'string') {
       return stringReplaceAllStringFuncUnchecked(receiver, pattern, onMatch, onNonMatch);
     }
     let buffer = new core.StringBuffer();
     let startIndex = 0;
-    for (let match of dart.dinvoke(pattern, 'allMatches', receiver)) {
+    for (let match of dart.as(dart.dinvoke(pattern, 'allMatches', receiver), core.Iterable$(core.Match))) {
       buffer.write(dart.dinvokef(onNonMatch, dart.dinvoke(receiver, 'substring', startIndex, match.start)));
       buffer.write(dart.dinvokef(onMatch, match));
       startIndex = match.end;
     }
     buffer.write(dart.dinvokef(onNonMatch, dart.dinvoke(receiver, 'substring', startIndex)));
     return buffer.toString();
   }
   // Function stringReplaceAllEmptyFuncUnchecked: (dynamic, dynamic, dynamic) → dynamic
   function stringReplaceAllEmptyFuncUnchecked(receiver, onMatch, onNonMatch) {
     let buffer = new core.StringBuffer();
@@ skipping 1051 matching lines @@
           subarray = array;
         } else {
           subarray = array.slice(i, dart.notNull(i) + dart.notNull(kMaxApply) < dart.notNull(end) ? dart.notNull(i) + dart.notNull(kMaxApply) : end);
         }
         result = result + String.fromCharCode.apply(null, subarray);
       }
       return result;
     }
     static stringFromCodePoints(codePoints) {
       let a = new core.List$(core.int).from([]);
-      for (let i of codePoints) {
+      for (let i of dart.as(codePoints, core.Iterable)) {
         if (!(typeof i == 'number'))
           throw new core.ArgumentError(i);
         if (dart.dbinary(i, '<=', 65535)) {
           a.add(dart.as(i, core.int));
         } else if (dart.dbinary(i, '<=', 1114111)) {
           a.add(55296['+'](dart.dbinary(dart.dbinary(dart.dbinary(i, '-', 65536), '>>', 10), '&', 1023)));
           a.add(56320['+'](dart.dbinary(i, '&', 1023)));
         } else {
           throw new core.ArgumentError(i);
         }
       }
       return Primitives[_fromCharCodeApply](a);
     }
     static stringFromCharCodes(charCodes) {
-      for (let i of charCodes) {
+      for (let i of dart.as(charCodes, core.Iterable)) {
         if (!(typeof i == 'number'))
           throw new core.ArgumentError(i);
         if (dart.dbinary(i, '<', 0))
           throw new core.ArgumentError(i);
         if (dart.dbinary(i, '>', 65535))
           return Primitives.stringFromCodePoints(charCodes);
       }
       return Primitives[_fromCharCodeApply](dart.as(charCodes, core.List$(core.int)));
     }
     static stringFromCharCode(charCode) {
@@ skipping 2093 matching lines @@
   exports.UnimplementedNoSuchMethodError = UnimplementedNoSuchMethodError;
   exports.random64 = random64;
   exports.jsonEncodeNative = jsonEncodeNative;
   exports.getIsolateAffinityTag = getIsolateAffinityTag;
   exports.loadDeferredLibrary = loadDeferredLibrary;
   exports.MainError = MainError;
   exports.missingMain = missingMain;
   exports.badMain = badMain;
   exports.mainHasTooManyParameters = mainHasTooManyParameters;
 })(_js_helper || (_js_helper = {}));