bors ce7bc51933 Auto merge of #30300 - sanxiyn:syntax-ext, r=nikomatsakis
This reduces iteration time (`make rustc-stage1`) for moved syntax extensions from 11 minutes to 3 minutes on my machine.

Because of the signature change, this is a [breaking-change] for people directly calling `expand_crate`. I think it is rare: from GitHub search, only case I found is [glassful](https://github.com/kmcallister/glassful).
2015-12-16 10:09:36 +00:00
..
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