Commits on Sep 25, 2017

1. Allow unused extern crate again …

   This is a partial revert of rust-lang#42588. There is a usability concern
   reported in rust-lang#44294 that was not considered in the discussion of the PR,
   so I would like to back this out of 1.21. As is, I think users would
   have a worse and more confusing experience with this lint enabled by
   default. We can re-enabled once there are better diagnostics or the case
   in rust-lang#44294 does not trigger the lint.

   

   dtolnay committed Sep 25, 2017
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