Check in codegen test expectations.

test/codegen/expect/corelib/iterable_length_test.js

+dart_library.library('corelib/iterable_length_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__iterable_length_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const collection = dart_sdk.collection;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const iterable_length_test = Object.create(null);
+  let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
+  let dynamicTobool = () => (dynamicTobool = dart.constFn(dart.definiteFunctionType(core.bool, [dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  iterable_length_test.A = class A extends collection.IterableBase {
+    new(count) {
+      this.count = count;
+      super.new();
+    }
+    get iterator() {
+      return new iterable_length_test.AIterator(this.count);
+    }
+  };
+  dart.addSimpleTypeTests(iterable_length_test.A);
+  dart.setSignature(iterable_length_test.A, {
+    constructors: () => ({new: dart.definiteFunctionType(iterable_length_test.A, [core.int])})
+  });
+  dart.defineExtensionMembers(iterable_length_test.A, ['iterator']);
+  const _count = Symbol('_count');
+  const _current = Symbol('_current');
+  iterable_length_test.AIterator = class AIterator extends core.Object {
+    new(count) {
+      this[_count] = count;
+      this[_current] = null;
+    }
+    moveNext() {
+      if (dart.notNull(this[_count]) > 0) {
+        this[_current] = this[_count];
+        this[_count] = dart.notNull(this[_count]) - 1;
+        return true;
+      }
+      this[_current] = null;
+      return false;
+    }
+    get current() {
+      return this[_current];
+    }
+  };
+  iterable_length_test.AIterator[dart.implements] = () => [core.Iterator];
+  dart.setSignature(iterable_length_test.AIterator, {
+    constructors: () => ({new: dart.definiteFunctionType(iterable_length_test.AIterator, [core.int])}),
+    methods: () => ({moveNext: dart.definiteFunctionType(core.bool, [])})
+  });
+  iterable_length_test.main = function() {
+    let a = new iterable_length_test.A(10);
+    expect$.Expect.equals(10, a.length);
+    a = new iterable_length_test.A(0);
+    expect$.Expect.equals(0, a.length);
+    a = new iterable_length_test.A(5);
+    expect$.Expect.equals(5, a.map(dart.dynamic)(dart.fn(e => dart.dsend(e, '+', 1), dynamicTodynamic()))[dartx.length]);
+    expect$.Expect.equals(3, a.where(dart.fn(e => core.bool._check(dart.dsend(e, '>=', 3)), dynamicTobool()))[dartx.length]);
+  };
+  dart.fn(iterable_length_test.main, VoidTodynamic());
+  // Exports:
+  exports.iterable_length_test = iterable_length_test;
+});