Check in codegen test expectations.

test/codegen/expect/language/patch_test.js

Index: test/codegen/expect/language/patch_test.js
diff --git a/test/codegen/expect/language/patch_test.js b/test/codegen/expect/language/patch_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..dcabb5a6118b0f8b0aa876e0764efd0e9b0db5a6
--- /dev/null
+++ b/test/codegen/expect/language/patch_test.js
@@ -0,0 +1,23 @@
+dart_library.library('language/patch_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__patch_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 patch_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  patch_test.patch = function() {
+    return 12;
+  };
+  dart.fn(patch_test.patch, VoidTodynamic());
+  patch_test.main = function() {
+    let x = patch_test.patch();
+    expect$.Expect.equals(12, x);
+  };
+  dart.fn(patch_test.main, VoidTodynamic());
+  // Exports:
+  exports.patch_test = patch_test;
+});