Check in codegen test expectations.

test/codegen/expect/language/generic_async_test.js

Index: test/codegen/expect/language/generic_async_test.js
diff --git a/test/codegen/expect/language/generic_async_test.js b/test/codegen/expect/language/generic_async_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..2e873ec26f1dea4ee2f24248197dc2c08c7bc282
--- /dev/null
+++ b/test/codegen/expect/language/generic_async_test.js
@@ -0,0 +1,30 @@
+dart_library.library('language/generic_async_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__generic_async_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const async = dart_sdk.async;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const generic_async_test = Object.create(null);
+  let TToFutureOfT = () => (TToFutureOfT = dart.constFn(dart.definiteFunctionType(T => [async.Future$(T), [T]])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  generic_async_test.foo = function(T) {
+    return x => {
+      return dart.async(function*(x) {
+        return x;
+      }, T, x);
+    };
+  };
+  dart.fn(generic_async_test.foo, TToFutureOfT());
+  generic_async_test.main = function() {
+    return dart.async(function*() {
+      expect$.Expect.equals(1, yield generic_async_test.foo(core.int)(1));
+    }, dart.dynamic);
+  };
+  dart.fn(generic_async_test.main, VoidTodynamic());
+  // Exports:
+  exports.generic_async_test = generic_async_test;
+});