Check in codegen test expectations.

test/codegen/expect/language/regress_21016_test.js

Index: test/codegen/expect/language/regress_21016_test.js
diff --git a/test/codegen/expect/language/regress_21016_test.js b/test/codegen/expect/language/regress_21016_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..aa9b2608487e408caee8024e1d0609c3c3962648
--- /dev/null
+++ b/test/codegen/expect/language/regress_21016_test.js
@@ -0,0 +1,56 @@
+dart_library.library('language/regress_21016_test', null, /* Imports */[
+  'dart_sdk'
+], function load__regress_21016_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const regress_21016_test = Object.create(null);
+  let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  const _boo = Symbol('_boo');
+  regress_21016_test.A = class A extends core.Object {
+    new() {
+      this[_boo] = 22;
+    }
+    get boo() {
+      return this[_boo];
+      return 1;
+    }
+  };
+  const _bar = Symbol('_bar');
+  regress_21016_test.B = class B extends core.Object {
+    new() {
+      this[_bar] = 42;
+    }
+    get boo() {
+      return this[_bar];
+      return 1;
+    }
+  };
+  regress_21016_test.Holder = class Holder extends core.Object {
+    tearMe(x) {
+      return dart.dload(x, 'boo');
+    }
+  };
+  dart.setSignature(regress_21016_test.Holder, {
+    methods: () => ({tearMe: dart.definiteFunctionType(dart.dynamic, [dart.dynamic])})
+  });
+  dart.defineLazy(regress_21016_test, {
+    get list() {
+      return [];
+    },
+    set list(_) {}
+  });
+  regress_21016_test.main = function() {
+    let holder = new regress_21016_test.Holder();
+    let hide = dart.dcall(dart.fn(X => X, dynamicTodynamic()), dart.bind(holder, 'tearMe'));
+    dart.dcall(hide, new regress_21016_test.A());
+    regress_21016_test.list[dartx.add](dart.bind(holder, 'tearMe'));
+    let x = regress_21016_test.list[dartx.get](0);
+    dart.dcall(x, new regress_21016_test.B());
+  };
+  dart.fn(regress_21016_test.main, VoidTodynamic());
+  // Exports:
+  exports.regress_21016_test = regress_21016_test;
+});