Check in codegen test expectations.

test/codegen/expect/language/issue13556_test.js

Index: test/codegen/expect/language/issue13556_test.js
diff --git a/test/codegen/expect/language/issue13556_test.js b/test/codegen/expect/language/issue13556_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..4c7a08305b049d9d9e02399deb95774cf76c317e
--- /dev/null
+++ b/test/codegen/expect/language/issue13556_test.js
@@ -0,0 +1,32 @@
+dart_library.library('language/issue13556_test', null, /* Imports */[
+  'dart_sdk'
+], function load__issue13556_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const issue13556_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  issue13556_test.A = class A extends core.Object {
+    new(opts) {
+      let a = opts && 'a' in opts ? opts.a : null;
+      this.a = a;
+    }
+  };
+  dart.setSignature(issue13556_test.A, {
+    constructors: () => ({new: dart.definiteFunctionType(issue13556_test.A, [], {a: dart.dynamic})})
+  });
+  issue13556_test.B = class B extends issue13556_test.A {
+    new() {
+      super.new();
+    }
+  };
+  dart.setSignature(issue13556_test.B, {
+    constructors: () => ({new: dart.definiteFunctionType(issue13556_test.B, [])})
+  });
+  issue13556_test.main = function() {
+  };
+  dart.fn(issue13556_test.main, VoidTodynamic());
+  // Exports:
+  exports.issue13556_test = issue13556_test;
+});