Check in codegen test expectations.

test/codegen/expect/language/regress_r24720_test.js

Index: test/codegen/expect/language/regress_r24720_test.js
diff --git a/test/codegen/expect/language/regress_r24720_test.js b/test/codegen/expect/language/regress_r24720_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..4e41e196f046c369606e6a6bd6df281128e1ca40
--- /dev/null
+++ b/test/codegen/expect/language/regress_r24720_test.js
@@ -0,0 +1,44 @@
+dart_library.library('language/regress_r24720_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__regress_r24720_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 regress_r24720_test = Object.create(null);
+  let A = () => (A = dart.constFn(regress_r24720_test.A$()))();
+  let AOfint = () => (AOfint = dart.constFn(regress_r24720_test.A$(core.int)))();
+  let AOfString = () => (AOfString = dart.constFn(regress_r24720_test.A$(core.String)))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  regress_r24720_test.A$ = dart.generic(T => {
+    class A extends core.Object {}
+    dart.addTypeTests(A);
+    return A;
+  });
+  regress_r24720_test.A = A();
+  regress_r24720_test.B = class B extends regress_r24720_test.A$(core.int) {
+    new() {
+      B.prototype.foo.call(this);
+    }
+    foo() {
+    }
+  };
+  dart.addSimpleTypeTests(regress_r24720_test.B);
+  dart.defineNamedConstructor(regress_r24720_test.B, 'foo');
+  dart.setSignature(regress_r24720_test.B, {
+    constructors: () => ({
+      new: dart.definiteFunctionType(regress_r24720_test.B, []),
+      foo: dart.definiteFunctionType(regress_r24720_test.B, [])
+    })
+  });
+  regress_r24720_test.main = function() {
+    expect$.Expect.isTrue(regress_r24720_test.B.is(new regress_r24720_test.B()));
+    expect$.Expect.isTrue(AOfint().is(new regress_r24720_test.B()));
+    expect$.Expect.isFalse(AOfString().is(new regress_r24720_test.B()));
+  };
+  dart.fn(regress_r24720_test.main, VoidTodynamic());
+  // Exports:
+  exports.regress_r24720_test = regress_r24720_test;
+});