[WIP] Treat crates specially when expanding#50101

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abonander wants to merge 2 commits intorust-lang:masterfrom

abonander:expand-crates-specially

Commits on Apr 19, 2018

don't panic on `#[derive]` placed on statements/expressions
abonander
committed

Commits on Apr 20, 2018

prototype: treat crates as special when expanding
abonander
committed