DDC fixes for path

lib/src/context.dart

Index: lib/src/context.dart
diff --git a/lib/src/context.dart b/lib/src/context.dart
index c2fe48d0d17b618ff43702302659786ea75a1aee..2c5e49a1a141354ed45537d374988510fec2e0dc 100644
--- a/lib/src/context.dart
+++ b/lib/src/context.dart
@@ -197,7 +197,7 @@ class Context {
   ///
   String join(String part1, [String part2, String part3, String part4,
       String part5, String part6, String part7, String part8]) {
-    var parts = [part1, part2, part3, part4, part5, part6, part7, part8];
+    var parts = <String>[part1, part2, part3, part4, part5, part6, part7, part8];

[vsm, 2015/03/26 19:33:31]

Note: 
  List<String> parts = [ ... ]
would work as well here and elsewhere.

[Bob Nystrom, 2015/03/27 20:24:04]

I prefer how you did this.

     _validateArgList("join", parts);
     return joinAll(parts.where((part) => part != null));
   }