Check in codegen test expectations.

test/codegen/expect/language/crash_12118_test.js

Index: test/codegen/expect/language/crash_12118_test.js
diff --git a/test/codegen/expect/language/crash_12118_test.js b/test/codegen/expect/language/crash_12118_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..9a71efc4a52b93c5c4a4d6ced015ab670bd59e6a
--- /dev/null
+++ b/test/codegen/expect/language/crash_12118_test.js
@@ -0,0 +1,33 @@
+dart_library.library('language/crash_12118_test', null, /* Imports */[
+  'dart_sdk'
+], function load__crash_12118_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const crash_12118_test = Object.create(null);
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  crash_12118_test.X = 42;
+  crash_12118_test.A = class A extends core.Object {
+    new(opts) {
+      let x = opts && 'x' in opts ? opts.x : crash_12118_test.X;
+      this.x = x;
+    }
+  };
+  dart.setSignature(crash_12118_test.A, {
+    constructors: () => ({new: dart.definiteFunctionType(crash_12118_test.A, [], {x: dart.dynamic})})
+  });
+  crash_12118_test.B = class B extends crash_12118_test.A {
+    new() {
+      super.new();
+    }
+  };
+  crash_12118_test.main = function() {
+    if (!dart.equals(new crash_12118_test.B().x, 42)) {
+      dart.throw('Test failed');
+    }
+  };
+  dart.fn(crash_12118_test.main, VoidTovoid());
+  // Exports:
+  exports.crash_12118_test = crash_12118_test;
+});