Check in codegen test expectations.

test/codegen/expect/language/issue18628_2_test_none_multi.js

Index: test/codegen/expect/language/issue18628_2_test_none_multi.js
diff --git a/test/codegen/expect/language/issue18628_2_test_none_multi.js b/test/codegen/expect/language/issue18628_2_test_none_multi.js
new file mode 100644
index 0000000000000000000000000000000000000000..8beb5cfe1849d1fb1f1b4870257045bead1a2bb8
--- /dev/null
+++ b/test/codegen/expect/language/issue18628_2_test_none_multi.js
@@ -0,0 +1,22 @@
+dart_library.library('language/issue18628_2_test_none_multi', null, /* Imports */[
+  'dart_sdk'
+], function load__issue18628_2_test_none_multi(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const issue18628_2_test_none_multi = Object.create(null);
+  let X = () => (X = dart.constFn(issue18628_2_test_none_multi.X$()))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  issue18628_2_test_none_multi.X$ = dart.generic(T => {
+    class X extends core.Object {}
+    dart.addTypeTests(X);
+    return X;
+  });
+  issue18628_2_test_none_multi.X = X();
+  issue18628_2_test_none_multi.main = function() {
+  };
+  dart.fn(issue18628_2_test_none_multi.main, VoidTodynamic());
+  // Exports:
+  exports.issue18628_2_test_none_multi = issue18628_2_test_none_multi;
+});