Check in codegen test expectations.

test/codegen/expect/language/lazy_map_test.js

+dart_library.library('language/lazy_map_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__lazy_map_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const lazy_map_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  dart.defineLazy(lazy_map_test, {
+    get data() {
+      return dart.map({a: 'a'});
+    },
+    set data(_) {}
+  });
+  lazy_map_test.main = function() {
+    expect$.Expect.equals('a', lazy_map_test.data[dartx.get]('a'));
+  };
+  dart.fn(lazy_map_test.main, VoidTodynamic());
+  // Exports:
+  exports.lazy_map_test = lazy_map_test;
+});