Check in codegen test expectations.

test/codegen/expect/language/mixin_illegal_object_test_none_multi.js

Index: test/codegen/expect/language/mixin_illegal_object_test_none_multi.js
diff --git a/test/codegen/expect/language/mixin_illegal_object_test_none_multi.js b/test/codegen/expect/language/mixin_illegal_object_test_none_multi.js
new file mode 100644
index 0000000000000000000000000000000000000000..d722bb54dddf1a5e162ca8b882a3053f3efe8e37
--- /dev/null
+++ b/test/codegen/expect/language/mixin_illegal_object_test_none_multi.js
@@ -0,0 +1,18 @@
+dart_library.library('language/mixin_illegal_object_test_none_multi', null, /* Imports */[
+  'dart_sdk'
+], function load__mixin_illegal_object_test_none_multi(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const mixin_illegal_object_test_none_multi = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  mixin_illegal_object_test_none_multi.S = class S extends core.Object {};
+  mixin_illegal_object_test_none_multi.C0 = class C0 extends mixin_illegal_object_test_none_multi.S {};
+  mixin_illegal_object_test_none_multi.main = function() {
+    new mixin_illegal_object_test_none_multi.C0();
+  };
+  dart.fn(mixin_illegal_object_test_none_multi.main, VoidTodynamic());
+  // Exports:
+  exports.mixin_illegal_object_test_none_multi = mixin_illegal_object_test_none_multi;
+});