Check in codegen test expectations.

test/codegen/expect/language/issue13179_test.js

Index: test/codegen/expect/language/issue13179_test.js
diff --git a/test/codegen/expect/language/issue13179_test.js b/test/codegen/expect/language/issue13179_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..bd13cf1762de82d05406419451d20ca13ec856d3
--- /dev/null
+++ b/test/codegen/expect/language/issue13179_test.js
@@ -0,0 +1,30 @@
+dart_library.library('language/issue13179_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__issue13179_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 issue13179_test = Object.create(null);
+  let __Tovoid = () => (__Tovoid = dart.constFn(dart.functionType(dart.void, [], [dart.dynamic])))();
+  let __Tovoid$ = () => (__Tovoid$ = dart.constFn(dart.definiteFunctionType(dart.void, [], [__Tovoid()])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  issue13179_test.count = 0;
+  issue13179_test.f = function(f) {
+    if (f === void 0) f = issue13179_test.f;
+    issue13179_test.count = dart.notNull(issue13179_test.count) + 1;
+    if (f != null) {
+      dart.dcall(f, null);
+    }
+  };
+  dart.fn(issue13179_test.f, __Tovoid$());
+  issue13179_test.main = function() {
+    issue13179_test.f();
+    expect$.Expect.equals(2, issue13179_test.count);
+  };
+  dart.fn(issue13179_test.main, VoidTodynamic());
+  // Exports:
+  exports.issue13179_test = issue13179_test;
+});