fixes #52, fields shadowing getters/setters or other fields

lib/runtime/dart/collection.js

Index: lib/runtime/dart/collection.js
diff --git a/lib/runtime/dart/collection.js b/lib/runtime/dart/collection.js
index 209233c939d4186e49028d79b293a7b147855fb3..3fc79f9c7371125d12e2a9c01bc0a5ef18a45c1f 100644
--- a/lib/runtime/dart/collection.js
+++ b/lib/runtime/dart/collection.js
@@ -967,8 +967,8 @@ var collection;
     return IterableBase;
   });
   let IterableBase = IterableBase$();
-  let _iterator = Symbol('_iterator');
   let _NOT_MOVED_YET = Symbol('_NOT_MOVED_YET');
+  let _iterator = Symbol('_iterator');
   let _state = Symbol('_state');
   let _move = Symbol('_move');
   let _HAS_NEXT_AND_NEXT_IN_CURRENT = Symbol('_HAS_NEXT_AND_NEXT_IN_CURRENT');
@@ -976,8 +976,8 @@ var collection;
   let HasNextIterator$ = dart.generic(function(E) {
     class HasNextIterator extends core.Object {
       HasNextIterator(iterator) {
-        this[_iterator] = iterator;
-        this[_state] = HasNextIterator[_NOT_MOVED_YET];
+        dart.initField(HasNextIterator, this, _iterator, iterator);
+        dart.initField(HasNextIterator, this, _state, HasNextIterator[_NOT_MOVED_YET]);
       }
       get hasNext() {
         if (this[_state] == HasNextIterator[_NOT_MOVED_YET])
@@ -1272,9 +1272,9 @@ var collection;
   let LinkedListEntry$ = dart.generic(function(E) {
     class LinkedListEntry extends core.Object {
       LinkedListEntry() {
-        this[_list] = null;
-        this[_next] = null;
-        this[_previous] = null;
+        dart.initField(LinkedListEntry, this, _list, null);
+        dart.initField(LinkedListEntry, this, _next, null);
+        dart.initField(LinkedListEntry, this, _previous, null);
       }
       get list() {
         return this[_list];
@@ -1919,7 +1919,7 @@ var collection;
   let MapView$ = dart.generic(function(K, V) {
     class MapView extends core.Object {
       MapView(map) {
-        this[_map] = map;
+        dart.initField(MapView, this, _map, map);
       }
       get(key) {
         return this[_map].get(key);
@@ -2096,9 +2096,9 @@ var collection;
   let DoubleLinkedQueueEntry$ = dart.generic(function(E) {
     class DoubleLinkedQueueEntry extends core.Object {
       DoubleLinkedQueueEntry(e) {
-        this[_element] = e;
-        this[_previous] = null;
-        this[_next] = null;
+        dart.initField(DoubleLinkedQueueEntry, this, _element, e);
+        dart.initField(DoubleLinkedQueueEntry, this, _previous, null);
+        dart.initField(DoubleLinkedQueueEntry, this, _next, null);
       }
       [_link](previous, next) {
         this[_next] = next;
@@ -3734,10 +3734,10 @@ var collection;
   let HashMapKeyIterator$ = dart.generic(function(E) {
     class HashMapKeyIterator extends core.Object {
       HashMapKeyIterator(map, keys) {
-        this[_map] = map;
-        this[_keys] = keys;
-        this[_offset] = 0;
-        this[_current] = null;
+        dart.initField(HashMapKeyIterator, this, _map, map);
+        dart.initField(HashMapKeyIterator, this, _keys, keys);
+        dart.initField(HashMapKeyIterator, this, _offset, 0);
+        dart.initField(HashMapKeyIterator, this, _current, null);
       }
       get current() {
         return this[_current];
@@ -4101,10 +4101,10 @@ var collection;
   let _LinkedCustomHashMap = _LinkedCustomHashMap$();
   class LinkedHashMapCell extends core.Object {
     LinkedHashMapCell(key, value) {
-      this[_key] = key;
-      this[_value] = value;
-      this[_next] = null;
-      this[_previous] = null;
+      dart.initField(LinkedHashMapCell, this, _key, key);
+      dart.initField(LinkedHashMapCell, this, _value, value);
+      dart.initField(LinkedHashMapCell, this, _next, null);
+      dart.initField(LinkedHashMapCell, this, _previous, null);
     }
   }
   let LinkedHashMapKeyIterable$ = dart.generic(function(E) {
@@ -4145,10 +4145,10 @@ var collection;
   let LinkedHashMapKeyIterator$ = dart.generic(function(E) {
     class LinkedHashMapKeyIterator extends core.Object {
       LinkedHashMapKeyIterator(map, modifications) {
-        this[_map] = map;
-        this[_modifications] = modifications;
-        this[_cell] = null;
-        this[_current] = null;
+        dart.initField(LinkedHashMapKeyIterator, this, _map, map);
+        dart.initField(LinkedHashMapKeyIterator, this, _modifications, modifications);
+        dart.initField(LinkedHashMapKeyIterator, this, _cell, null);
+        dart.initField(LinkedHashMapKeyIterator, this, _current, null);
         this[_cell] = dart.as(dart.dload(this[_map], _first), LinkedHashMapCell);
       }
       get current() {
@@ -4481,10 +4481,10 @@ var collection;
   let HashSetIterator$ = dart.generic(function(E) {
     class HashSetIterator extends core.Object {
       HashSetIterator(set, elements) {
-        this[_set] = set;
-        this[_elements] = elements;
-        this[_offset] = 0;
-        this[_current] = null;
+        dart.initField(HashSetIterator, this, _set, set);
+        dart.initField(HashSetIterator, this, _elements, elements);
+        dart.initField(HashSetIterator, this, _offset, 0);
+        dart.initField(HashSetIterator, this, _current, null);
       }
       get current() {
         return this[_current];
@@ -4866,18 +4866,18 @@ var collection;
   let _LinkedCustomHashSet = _LinkedCustomHashSet$();
   class LinkedHashSetCell extends core.Object {
     LinkedHashSetCell(element) {
-      this[_element] = element;
-      this[_next] = null;
-      this[_previous] = null;
+      dart.initField(LinkedHashSetCell, this, _element, element);
+      dart.initField(LinkedHashSetCell, this, _next, null);
+      dart.initField(LinkedHashSetCell, this, _previous, null);
     }
   }
   let LinkedHashSetIterator$ = dart.generic(function(E) {
     class LinkedHashSetIterator extends core.Object {
       LinkedHashSetIterator(set, modifications) {
-        this[_set] = set;
-        this[_modifications] = modifications;
-        this[_cell] = null;
-        this[_current] = null;
+        dart.initField(LinkedHashSetIterator, this, _set, set);
+        dart.initField(LinkedHashSetIterator, this, _modifications, modifications);
+        dart.initField(LinkedHashSetIterator, this, _cell, null);
+        dart.initField(LinkedHashSetIterator, this, _current, null);
         this[_cell] = dart.as(dart.dload(this[_set], _first), LinkedHashSetCell);
       }
       get current() {