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auto merge of #17134 : vberger/rust/lint_unused_extern_crate, r=alexcrichton

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This PR creates a new lint : ``unused_extern_crate``, which do pretty much the same thing as ``unused_import``, but for ``extern crate`` statements. It is related to feature request #10385.

I adapted the code tracking used imports so that it tracks extern crates usage as well. This was mainly trial and error and while I believe all cases are covered, there might be some code I added that is useless (long compile times didn't give me the opportunity to check this in detail).

Also, I removed some unused ``extern crate`` statements from the libs, that where spotted by this new lint.
This commit is contained in:
bors 2014-09-12 19:05:53 +00:00
commit 8780d9c6b5
6 changed files with 100 additions and 7 deletions
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2
src/libsyntax/diagnostic.rs
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@ -8,8 +8,6 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.
extern crate libc;
use codemap::{Pos, Span};
use codemap;
use diagnostics;