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This is a request for comments. Do we want to expose library prefixes like this? Is there a way to import with a prefix already and lookup members? The reason why I would like to do this is so that I can import the user-supplied builtins library under a prefix. This will be a useful first step to move the print function to corelib while preserving the ability to patch in a print implementation via the builtins library. R=iposva@google.com,turnidge@google.com BUG= Review URL: https://chromiumcodereview.appspot.com//10867032 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@11494 260f80e4-7a28-3924-810f-c04153c831b5