Check in codegen test expectations.

test/codegen/expect/language/const_escape_frog_test.js

Index: test/codegen/expect/language/const_escape_frog_test.js
diff --git a/test/codegen/expect/language/const_escape_frog_test.js b/test/codegen/expect/language/const_escape_frog_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..d1abf733990d36bddec1e3f8754a132795c6939c
--- /dev/null
+++ b/test/codegen/expect/language/const_escape_frog_test.js
@@ -0,0 +1,38 @@
+dart_library.library('language/const_escape_frog_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__const_escape_frog_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 const_escape_frog_test = Object.create(null);
+  let BarOfFoo = () => (BarOfFoo = dart.constFn(const_escape_frog_test.Bar$(const_escape_frog_test.Foo)))();
+  let Bar = () => (Bar = dart.constFn(const_escape_frog_test.Bar$()))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  const_escape_frog_test.Foo = class Foo extends core.Object {
+    new() {
+      this.bar = dart.const(new (BarOfFoo())());
+    }
+  };
+  const_escape_frog_test.Bar$ = dart.generic(T => {
+    class Bar extends core.Object {
+      new() {
+      }
+    }
+    dart.addTypeTests(Bar);
+    dart.setSignature(Bar, {
+      constructors: () => ({new: dart.definiteFunctionType(const_escape_frog_test.Bar$(T), [])})
+    });
+    return Bar;
+  });
+  const_escape_frog_test.Bar = Bar();
+  let const$;
+  const_escape_frog_test.main = function() {
+    expect$.Expect.equals(new const_escape_frog_test.Foo().bar, const$ || (const$ = dart.const(new (BarOfFoo())())));
+  };
+  dart.fn(const_escape_frog_test.main, VoidTodynamic());
+  // Exports:
+  exports.const_escape_frog_test = const_escape_frog_test;
+});