Check in codegen test expectations.

test/codegen/expect/language/duplicate_implements_test_none_multi.js

Index: test/codegen/expect/language/duplicate_implements_test_none_multi.js
diff --git a/test/codegen/expect/language/duplicate_implements_test_none_multi.js b/test/codegen/expect/language/duplicate_implements_test_none_multi.js
new file mode 100644
index 0000000000000000000000000000000000000000..59cce14e18ee66a10d011fb998cbaa92ead5ae63
--- /dev/null
+++ b/test/codegen/expect/language/duplicate_implements_test_none_multi.js
@@ -0,0 +1,24 @@
+dart_library.library('language/duplicate_implements_test_none_multi', null, /* Imports */[
+  'dart_sdk'
+], function load__duplicate_implements_test_none_multi(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const duplicate_implements_test_none_multi = Object.create(null);
+  let K = () => (K = dart.constFn(duplicate_implements_test_none_multi.K$()))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  duplicate_implements_test_none_multi.I = class I extends core.Object {};
+  duplicate_implements_test_none_multi.J = class J extends core.Object {};
+  duplicate_implements_test_none_multi.K$ = dart.generic(T => {
+    class K extends core.Object {}
+    dart.addTypeTests(K);
+    return K;
+  });
+  duplicate_implements_test_none_multi.K = K();
+  duplicate_implements_test_none_multi.main = function() {
+  };
+  dart.fn(duplicate_implements_test_none_multi.main, VoidTodynamic());
+  // Exports:
+  exports.duplicate_implements_test_none_multi = duplicate_implements_test_none_multi;
+});