Check in codegen test expectations.

test/codegen/expect/language/closure_parameter_types_test.js

Index: test/codegen/expect/language/closure_parameter_types_test.js
diff --git a/test/codegen/expect/language/closure_parameter_types_test.js b/test/codegen/expect/language/closure_parameter_types_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..8915f933faab223283beb67f06c16631d73b13e7
--- /dev/null
+++ b/test/codegen/expect/language/closure_parameter_types_test.js
@@ -0,0 +1,41 @@
+dart_library.library('language/closure_parameter_types_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__closure_parameter_types_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 closure_parameter_types_test = Object.create(null);
+  let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  const _do = Symbol('_do');
+  closure_parameter_types_test.A = class A extends core.Object {
+    new(f) {
+      this.f = f;
+    }
+    [_do]() {
+      return dart.dcall(this.f, 1);
+    }
+  };
+  dart.setSignature(closure_parameter_types_test.A, {
+    constructors: () => ({new: dart.definiteFunctionType(closure_parameter_types_test.A, [core.Function])}),
+    methods: () => ({[_do]: dart.definiteFunctionType(dart.dynamic, [])})
+  });
+  closure_parameter_types_test.main = function() {
+    let invokeCount = 0;
+    function closure(a) {
+      if (invokeCount++ == 1) {
+        expect$.Expect.isTrue(typeof a == 'number');
+      }
+    }
+    dart.fn(closure, dynamicTodynamic());
+    closure('s');
+    new closure_parameter_types_test.A(closure)[_do]();
+    expect$.Expect.equals(2, invokeCount);
+  };
+  dart.fn(closure_parameter_types_test.main, VoidTodynamic());
+  // Exports:
+  exports.closure_parameter_types_test = closure_parameter_types_test;
+});