Check in codegen test expectations.

test/codegen/expect/language/ct_const4_test.js

+dart_library.library('language/ct_const4_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__ct_const4_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 ct_const4_test = Object.create(null);
+  const ct_const4_lib = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  ct_const4_lib.B = 1;
+  ct_const4_test.A = ct_const4_lib.B;
+  ct_const4_test.main = function() {
+    expect$.Expect.equals(1, ct_const4_test.A);
+  };
+  dart.fn(ct_const4_test.main, VoidTodynamic());
+  // Exports:
+  exports.ct_const4_test = ct_const4_test;
+  exports.ct_const4_lib = ct_const4_lib;
+});