Check in codegen test expectations.

test/codegen/expect/language/generic_sync_star_test.js

+dart_library.library('language/generic_sync_star_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__generic_sync_star_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 generic_sync_star_test = Object.create(null);
+  let TToIterableOfT = () => (TToIterableOfT = dart.constFn(dart.definiteFunctionType(T => [core.Iterable$(T), [T]])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  generic_sync_star_test.foo = function(T) {
+    return x => {
+      return dart.syncStar(function*(x) {
+        for (let i = 0; i < 3; i++) {
+          yield x;
+        }
+      }, T, x);
+    };
+  };
+  dart.fn(generic_sync_star_test.foo, TToIterableOfT());
+  generic_sync_star_test.main = function() {
+    for (let x of generic_sync_star_test.foo(core.int)(1)) {
+      expect$.Expect.equals(1, x);
+    }
+  };
+  dart.fn(generic_sync_star_test.main, VoidTodynamic());
+  // Exports:
+  exports.generic_sync_star_test = generic_sync_star_test;
+});