fixes #157, renaming local library identifiers if needed.

test/codegen/expect/try_catch.js

Index: test/codegen/expect/try_catch.js
diff --git a/test/codegen/expect/try_catch.js b/test/codegen/expect/try_catch.js
index 9e499469bebc3a579c4ff4680fd57b98e13a223c..abd0d8d5f517ebbd199db6ae1d39fe2575f9f6fd 100644
--- a/test/codegen/expect/try_catch.js
+++ b/test/codegen/expect/try_catch.js
@@ -1,5 +1,5 @@
-var try_catch;
-(function(exports) {
+var try_catch, core;
+(function(exports, core) {
   'use strict';
   // Function foo: () → dynamic
   function foo() {
@@ -74,4 +74,4 @@ var try_catch;
   exports.qux = qux;
   exports.wub = wub;
   exports.main = main;
-})(try_catch || (try_catch = {}));
+})(try_catch || (try_catch = {}), core);