fixes #157, renaming local library identifiers if needed.

lib/runtime/dart/_interceptors.js

Index: lib/runtime/dart/_interceptors.js
diff --git a/lib/runtime/dart/_interceptors.js b/lib/runtime/dart/_interceptors.js
index 6ebafabd39c0d05a7371d866dd43a0a09020eb54..98d51e8f98b9e09627751cf720e2a6ae1b478635 100644
--- a/lib/runtime/dart/_interceptors.js
+++ b/lib/runtime/dart/_interceptors.js
@@ -1,5 +1,5 @@
-var _interceptors;
-(function(exports) {
+var _interceptors, core, _js_helper, _internal, _foreign_helper, _js_embedded_names;

[vsm, 2015/05/05 22:01:18]

It might be more readable to just list these out line by line.  E.g.,:

var _js_helper = _js_helper || {};

Alternatively,

var core = dart.required(core); // Asserts core is loaded already
var _js_helper = dart.lazy(_js_helper); // Defined if needed.

[Jennifer Messerly, 2015/05/05 22:04:44]

sounds good! yeah, almost did something like that but wasn't sure how much to
change, this is exactly the nudge I needed :). Really like the dart.required
assertion idea.

+(function(exports, core, _js_helper, _internal, _foreign_helper, _js_embedded_names) {
   'use strict';
   let JSArray = Array;
   let JSMutableArray$ = dart.generic(function(E) {
@@ -1086,4 +1086,4 @@ var _interceptors;
   exports.JavaScriptObject = JavaScriptObject;
   exports.PlainJavaScriptObject = PlainJavaScriptObject;
   exports.UnknownJavaScriptObject = UnknownJavaScriptObject;
-})(_interceptors || (_interceptors = {}));
+})(_interceptors || (_interceptors = {}), core, _js_helper || (_js_helper = {}), _internal, _foreign_helper, _js_embedded_names);