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test/codegen/expect/collection/priority_queue.js

 dart_library.library('collection/priority_queue', null, /* Imports */[
   "dart/_runtime",
   'dart/core',
   'dart/collection'
 ], /* Lazy imports */[
 ], function(exports, dart, core, collection) {
   'use strict';
   let dartx = dart.dartx;
   const PriorityQueue$ = dart.generic(function(E) {
     class PriorityQueue extends core.Object {}
     return PriorityQueue;
   });
   let PriorityQueue = PriorityQueue$();
   const _queue = Symbol('_queue');
   const _length = Symbol('_length');
   const _add = Symbol('_add');
   const _locate = Symbol('_locate');
   const _removeLast = Symbol('_removeLast');
   const _bubbleUp = Symbol('_bubbleUp');
   const _bubbleDown = Symbol('_bubbleDown');
   const _grow = Symbol('_grow');
   const HeapPriorityQueue$ = dart.generic(function(E) {
     class HeapPriorityQueue extends core.Object {
       HeapPriorityQueue(comparison) {
         if (comparison === void 0) comparison = null;
         this[_queue] = core.List$(E).new(HeapPriorityQueue$()._INITIAL_CAPACITY);
-        this.comparison = comparison != null ? comparison : core.Comparable.compare;
+        this.comparison = dart.as(comparison != null ? comparison : core.Comparable.compare, core.Comparator);
         this[_length] = 0;
       }
       add(element) {
         dart.as(element, E);
         this[_add](element);
       }
       addAll(elements) {
         dart.as(elements, core.Iterable$(E));
         for (let element of elements) {
           this[_add](element);
@@ skipping 194 matching lines @@
     const __CastType0 = dart.typedef('__CastType0', () => dart.functionType(core.int, [E, E]));
     return __CastType0;
   });
   let __CastType0 = __CastType0$();
   // Exports:
   exports.PriorityQueue$ = PriorityQueue$;
   exports.PriorityQueue = PriorityQueue;
   exports.HeapPriorityQueue$ = HeapPriorityQueue$;
   exports.HeapPriorityQueue = HeapPriorityQueue;
 });