Downwards closure inference

lib/runtime/dart/collection.js

 var collection;
 (function(exports) {
   'use strict';
   let _source = Symbol('_source');
   let UnmodifiableListView$ = dart.generic(function(E) {
     class UnmodifiableListView extends _internal.UnmodifiableListBase$(E) {
       UnmodifiableListView(source) {
         this[_source] = source;
         super.UnmodifiableListBase();
       }
@@ skipping 1122 matching lines @@
         super.IterableBase();
         this[_next] = this[_previous] = this;
       }
       addFirst(entry) {
         this[_insertAfter](this, entry);
       }
       add(entry) {
         this[_insertAfter](this[_previous], entry);
       }
       addAll(entries) {
-        entries.forEach(dart.closureWrap(((entry) => this[_insertAfter](this[_previous], dart.as(entry, E))).bind(this), "(E) → void"));
+        entries.forEach(dart.as(((entry) => this[_insertAfter](this[_previous], dart.as(entry, E))).bind(this), dart.throw_("Unimplemented type (E) → void")));
       }
       remove(entry) {
         if (!dart.equals(entry[_list], this))
           return false;
         this[_unlink](entry);
         return true;
       }
       get iterator() {
         return new (_LinkedListIterator$(E))(this);
       }
@@ skipping 2213 matching lines @@
       get isEmpty() {
         return this[_length] == 0;
       }
       get isNotEmpty() {
         return !dart.notNull(this.isEmpty);
       }
       get keys() {
         return new (HashMapKeyIterable$(K))(this);
       }
       get values() {
-        return new (_internal.MappedIterable$(K, V))(this.keys, dart.closureWrap(((each) => this.get(each)).bind(this), "(K) → V"));
+        return new (_internal.MappedIterable$(K, V))(this.keys, dart.as(((each) => this.get(each)).bind(this), dart.throw_("Unimplemented type (K) → V")));
       }
       containsKey(key) {
         if (_HashMap[_isStringKey](key)) {
           let strings = this[_strings];
           return strings == null ? false : _HashMap[_hasTableEntry](strings, key);
         } else if (_HashMap[_isNumericKey](key)) {
           let nums = this[_nums];
           return nums == null ? false : _HashMap[_hasTableEntry](nums, key);
         } else {
           return this[_containsKey](key);
@@ skipping 380 matching lines @@
       get isEmpty() {
         return this[_length] == 0;
       }
       get isNotEmpty() {
         return !dart.notNull(this.isEmpty);
       }
       get keys() {
         return new (LinkedHashMapKeyIterable$(K))(this);
       }
       get values() {
-        return new (_internal.MappedIterable$(K, V))(this.keys, dart.closureWrap(((each) => this.get(each)).bind(this), "(K) → V"));
+        return new (_internal.MappedIterable$(K, V))(this.keys, dart.as(((each) => this.get(each)).bind(this), dart.throw_("Unimplemented type (K) → V")));
       }
       containsKey(key) {
         if (_LinkedHashMap[_isStringKey](key)) {
           let strings = this[_strings];
           if (strings == null)
             return false;
           let cell = dart.as(_LinkedHashMap[_getTableEntry](strings, key), LinkedHashMapCell);
           return cell != null;
         } else if (_LinkedHashMap[_isNumericKey](key)) {
           let nums = this[_nums];
           if (nums == null)
             return false;
           let cell = dart.as(_LinkedHashMap[_getTableEntry](nums, key), LinkedHashMapCell);
           return cell != null;
         } else {
           return this[_containsKey](key);
         }
       }
       [_containsKey](key) {
         let rest = this[_rest];
         if (rest == null)
           return false;
         let bucket = this[_getBucket](rest, key);
         return dart.notNull(this[_findBucketIndex](bucket, key)) >= 0;
       }
       containsValue(value) {
-        return this.keys.any(dart.closureWrap(((each) => dart.equals(this.get(each), value)).bind(this), "(K) → bool"));
+        return this.keys.any(dart.as(((each) => dart.equals(this.get(each), value)).bind(this), dart.throw_("Unimplemented type (K) → bool")));
       }
       addAll(other) {
         other.forEach(((key, value) => {
           this.set(key, value);
         }).bind(this));
       }
       get(key) {
         if (_LinkedHashMap[_isStringKey](key)) {
           let strings = this[_strings];
           if (strings == null)
@@ skipping 1127 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;
 })(collection || (collection = {}));