Check in codegen test expectations.

test/codegen/expect/language/temp_mangling_test.js

Index: test/codegen/expect/language/temp_mangling_test.js
diff --git a/test/codegen/expect/language/temp_mangling_test.js b/test/codegen/expect/language/temp_mangling_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..e96e88e44909894a1f8cba80abc6b24510551348
--- /dev/null
+++ b/test/codegen/expect/language/temp_mangling_test.js
@@ -0,0 +1,37 @@
+dart_library.library('language/temp_mangling_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__temp_mangling_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 temp_mangling_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  temp_mangling_test.main = function() {
+    temp_mangling_test.testOne();
+    temp_mangling_test.testTwo();
+  };
+  dart.fn(temp_mangling_test.main, VoidTodynamic());
+  temp_mangling_test.testOne = function() {
+    let t0 = core.List.new();
+    expect$.Expect.isTrue(typeof t0[dartx.length] == 'number');
+    expect$.Expect.isTrue(core.List.is(t0));
+  };
+  dart.fn(temp_mangling_test.testOne, VoidTodynamic());
+  temp_mangling_test.testTwo = function() {
+    let x = core.List.new();
+    let x_0 = core.List.new();
+    {
+      let x = core.Set.new();
+      expect$.Expect.equals(0, x.length);
+      expect$.Expect.isTrue(x.isEmpty);
+    }
+    expect$.Expect.isTrue(core.List.is(x));
+    expect$.Expect.isTrue(core.List.is(x_0));
+  };
+  dart.fn(temp_mangling_test.testTwo, VoidTodynamic());
+  // Exports:
+  exports.temp_mangling_test = temp_mangling_test;
+});