Check in codegen test expectations.

test/codegen/expect/corelib/set_remove_test.js

+dart_library.library('corelib/set_remove_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__set_remove_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const _interceptors = dart_sdk._interceptors;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const set_remove_test = Object.create(null);
+  let SetOfB = () => (SetOfB = dart.constFn(core.Set$(set_remove_test.B)))();
+  let JSArrayOfB = () => (JSArrayOfB = dart.constFn(_interceptors.JSArray$(set_remove_test.B)))();
+  let JSArrayOfSetOfB = () => (JSArrayOfSetOfB = dart.constFn(_interceptors.JSArray$(SetOfB())))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  set_remove_test.A = class A extends core.Object {
+    new() {
+    }
+  };
+  dart.setSignature(set_remove_test.A, {
+    constructors: () => ({new: dart.definiteFunctionType(set_remove_test.A, [])})
+  });
+  set_remove_test.B = class B extends set_remove_test.A {
+    new() {
+      super.new();
+    }
+  };
+  dart.setSignature(set_remove_test.B, {
+    constructors: () => ({new: dart.definiteFunctionType(set_remove_test.B, [])})
+  });
+  let const$;
+  let const$0;
+  set_remove_test.main = function() {
+    let set1 = SetOfB().new();
+    set1.add(const$ || (const$ = dart.const(new set_remove_test.B())));
+    let set2 = SetOfB().new();
+    let list = JSArrayOfB().of([const$0 || (const$0 = dart.const(new set_remove_test.B()))]);
+    let set3 = list[dartx.toSet]();
+    let sets = JSArrayOfSetOfB().of([set1, set2, set3]);
+    for (let setToTest of sets) {
+      expect$.Expect.isFalse(setToTest.remove(new set_remove_test.A()));
+    }
+  };
+  dart.fn(set_remove_test.main, VoidTodynamic());
+  // Exports:
+  exports.set_remove_test = set_remove_test;
+});