Check in codegen test expectations.

test/codegen/expect/corelib/hidden_library2_test_01_multi.js

Index: test/codegen/expect/corelib/hidden_library2_test_01_multi.js
diff --git a/test/codegen/expect/corelib/hidden_library2_test_01_multi.js b/test/codegen/expect/corelib/hidden_library2_test_01_multi.js
new file mode 100644
index 0000000000000000000000000000000000000000..23b7a387c1f926812dfa2613426a8889591d214a
--- /dev/null
+++ b/test/codegen/expect/corelib/hidden_library2_test_01_multi.js
@@ -0,0 +1,22 @@
+dart_library.library('corelib/hidden_library2_test_01_multi', null, /* Imports */[
+  'dart_sdk'
+], function load__hidden_library2_test_01_multi(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const _interceptors = dart_sdk._interceptors;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const hidden_library2_test_01_multi = Object.create(null);
+  let JSArrayOfString = () => (JSArrayOfString = dart.constFn(_interceptors.JSArray$(core.String)))();
+  let StringTobool = () => (StringTobool = dart.constFn(dart.definiteFunctionType(core.bool, [core.String])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  hidden_library2_test_01_multi.main = function() {
+    core.print(JSArrayOfString().of(['x'])[dartx.where](dart.fn(_ => {
+      dart.throw('fisk');
+      return true;
+    }, StringTobool()))[dartx.toList]());
+  };
+  dart.fn(hidden_library2_test_01_multi.main, VoidTodynamic());
+  // Exports:
+  exports.hidden_library2_test_01_multi = hidden_library2_test_01_multi;
+});