Check in codegen test expectations.

test/codegen/expect/language/factory_arrow_test.js

+dart_library.library('language/factory_arrow_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__factory_arrow_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 factory_arrow_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  factory_arrow_test.A = class A extends core.Object {
+    foo() {
+    }
+    static new() {
+      return new factory_arrow_test.A.foo();
+    }
+  };
+  dart.defineNamedConstructor(factory_arrow_test.A, 'foo');
+  dart.setSignature(factory_arrow_test.A, {
+    constructors: () => ({
+      foo: dart.definiteFunctionType(factory_arrow_test.A, []),
+      new: dart.definiteFunctionType(factory_arrow_test.A, [])
+    })
+  });
+  factory_arrow_test.main = function() {
+    expect$.Expect.isTrue(factory_arrow_test.A.is(factory_arrow_test.A.new()));
+  };
+  dart.fn(factory_arrow_test.main, VoidTodynamic());
+  // Exports:
+  exports.factory_arrow_test = factory_arrow_test;
+});