Check in codegen test expectations.

test/codegen/expect/language/function_propagation_test.js

Index: test/codegen/expect/language/function_propagation_test.js
diff --git a/test/codegen/expect/language/function_propagation_test.js b/test/codegen/expect/language/function_propagation_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..38a0e8c79f2664b615e1101daa03123a1c670af7
--- /dev/null
+++ b/test/codegen/expect/language/function_propagation_test.js
@@ -0,0 +1,50 @@
+dart_library.library('language/function_propagation_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__function_propagation_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 function_propagation_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  function_propagation_test.A = dart.callableClass(function A(...args) {
+    const self = this;
+    function call(...args) {
+      return self.call.apply(self, args);
+    }
+    call.__proto__ = this.__proto__;
+    call.new.apply(call, args);
+    return call;
+  }, class A extends core.Object {
+    call(str) {
+      return 499;
+    }
+  });
+  dart.setSignature(function_propagation_test.A, {
+    methods: () => ({call: dart.definiteFunctionType(core.int, [core.String])})
+  });
+  function_propagation_test.F = dart.typedef('F', () => dart.functionType(core.int, [core.String]));
+  function_propagation_test.main = function() {
+    let a = new function_propagation_test.A();
+    if (core.Function.is(a)) {
+      expect$.Expect.isTrue(function_propagation_test.A.is(a));
+    } else {
+      expect$.Expect.fail("a should be a Function");
+    }
+    let a2 = new function_propagation_test.A();
+    if (function_propagation_test.F.is(a2)) {
+      expect$.Expect.isTrue(function_propagation_test.A.is(a2));
+    } else {
+      expect$.Expect.fail("a2 should be an F");
+    }
+    let a3 = new function_propagation_test.A();
+    expect$.Expect.isTrue(function_propagation_test.A.is(a3));
+    let a4 = new function_propagation_test.A();
+    expect$.Expect.isTrue(function_propagation_test.A.is(a4));
+  };
+  dart.fn(function_propagation_test.main, VoidTodynamic());
+  // Exports:
+  exports.function_propagation_test = function_propagation_test;
+});