Check in codegen test expectations.

test/codegen/expect/language/closure_cycles_test.js

+dart_library.library('language/closure_cycles_test', null, /* Imports */[
+  'dart_sdk'
+], function load__closure_cycles_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const async = dart_sdk.async;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const closure_cycles_test = Object.create(null);
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
+  closure_cycles_test.X = class X extends core.Object {
+    new() {
+      this.onX = null;
+      async.Timer.run(dart.fn(() => dart.dcall(this.onX, new closure_cycles_test.Y()), VoidTovoid()));
+    }
+  };
+  dart.setSignature(closure_cycles_test.X, {
+    constructors: () => ({new: dart.definiteFunctionType(closure_cycles_test.X, [])})
+  });
+  closure_cycles_test.Y = class Y extends core.Object {
+    new() {
+      this.onY = null;
+      this.heavyMemory = null;
+      this.heavyMemory = core.List.new(10 * 1024 * 1024);
+      if ((() => {
+        let x = closure_cycles_test.Y.count;
+        closure_cycles_test.Y.count = dart.notNull(x) + 1;
+        return x;
+      })() > 100) return;
+      async.Timer.run(dart.fn(() => dart.dcall(this.onY), VoidTovoid()));
+    }
+  };
+  dart.setSignature(closure_cycles_test.Y, {
+    constructors: () => ({new: dart.definiteFunctionType(closure_cycles_test.Y, [])})
+  });
+  closure_cycles_test.Y.count = 0;
+  closure_cycles_test.doIt = function() {
+    let x = new closure_cycles_test.X();
+    x.onX = dart.fn(y => {
+      dart.dput(y, 'onY', dart.fn(() => {
+        y;
+        closure_cycles_test.doIt();
+      }, VoidTodynamic()));
+    }, dynamicTodynamic());
+  };
+  dart.fn(closure_cycles_test.doIt, VoidTovoid());
+  closure_cycles_test.main = function() {
+    closure_cycles_test.doIt();
+  };
+  dart.fn(closure_cycles_test.main, VoidTovoid());
+  // Exports:
+  exports.closure_cycles_test = closure_cycles_test;
+});