Check for duplicate library names

test/codegen/expect/8invalid-chars.in+file_name.js

Index: test/codegen/expect/8invalid-chars.in+file_name.js
diff --git a/test/codegen/expect/8invalid-chars.in+file_name.js b/test/codegen/expect/8invalid-chars.in+file_name.js
index bc65ecf65f00764449399f1ab1aebf3d3920ed00..442e885d96b6d07d1ece7ddf143ded7a9628db01 100644
--- a/test/codegen/expect/8invalid-chars.in+file_name.js
+++ b/test/codegen/expect/8invalid-chars.in+file_name.js
@@ -1,9 +1,10 @@
-var $8invalid$45chars$46in$43file_name = dart.defineLibrary($8invalid$45chars$46in$43file_name, {});
-(function(exports) {
+dart.library('8invalid-chars.in+file_name', null, /* Imports */[
+], /* Lazy imports */[
+], function(exports) {
   'use strict';
   function main() {
   }
   dart.fn(main);
   // Exports:
   exports.main = main;
-})($8invalid$45chars$46in$43file_name);
+});