Don't read past limit for in BufRead instance of Take

[troplin]

Similar to Read::read, BufRead::fill_buf impl of Take should not call inner.fill_buf if the limit is already reached.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @aturon (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

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[alexcrichton]

@bors: r+ a3329f5

Thanks!

[alexcrichton]

@bors: rollup

[bors]

⌛ Testing commit a3329f5 with merge bda39d0...

[bors]

💔 Test failed - auto-win-msvc-64-cargotest

[alexcrichton]

@bors: retry

On Thu, Apr 14, 2016 at 12:36 PM, bors notifications@github.com wrote:

[image: 💔] Test failed - auto-win-msvc-64-cargotest
http://buildbot.rust-lang.org/builders/auto-win-msvc-64-cargotest/builds/73

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#32855 (comment)