google/traceur-compiler — pull request #392 by johnjbarton (2013-11-01 21:48:24+00:00)
Title: Use System.normalize/resolve, but allow .js in ImportSpecifiers.

(Stepping stone for self-hosting compiler).

Define System.normalResolve() and replace resolveUrl() calls.
Throw if we resolve @....js.
Throw internal error if standard module is not found.
Return early in System.resolve for standard module names.