Remove unused trait imports

[sanxiyn]

No description provided.

[alexcrichton]

@bors: r+ 01fb27f

Were these caught by a lint? One that we don't have turned on?

[sanxiyn]

Yes, these were found by #30021. I decided to send this first while debugging the rebase. (It doesn't finish bootstrapping yet.)

[alexcrichton]

Neat!

[bors]

⌛ Testing commit 01fb27f with merge 8ea047a...

[bors]

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

[alexcrichton]

@bors: retry

On Thu, Apr 14, 2016 at 12:22 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/66

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#32909 (comment)

[bors]

⌛ Testing commit 01fb27f with merge ef44bd0...

[bors]

💔 Test failed - auto-mac-64-opt

[alexcrichton]

@bors: retry

On Fri, Apr 15, 2016 at 8:23 AM, bors notifications@github.com wrote:

[image: 💔] Test failed - auto-mac-64-opt
http://buildbot.rust-lang.org/builders/auto-mac-64-opt/builds/8752

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#32909 (comment)

[bors]

⌛ Testing commit 01fb27f with merge bb21b59...

[bors]

💔 Test failed - auto-win-gnu-32-opt-rustbuild

[alexcrichton]

@bors: retry

On Sat, Apr 16, 2016 at 1:15 AM, bors notifications@github.com wrote:

[image: 💔] Test failed - auto-win-gnu-32-opt-rustbuild
http://buildbot.rust-lang.org/builders/auto-win-gnu-32-opt-rustbuild/builds/731

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#32909 (comment)

[bors]

⌛ Testing commit 01fb27f with merge 054a4b4...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-cargotest, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-opt-mir, auto-linux-64-opt-rustbuild, auto-linux-64-x-android-t, auto-linux-64-x-armhf, auto-linux-64-x-armsf, auto-linux-64-x-freebsd, auto-linux-64-x-netbsd, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-mac-64-opt-rustbuild, auto-mac-ios-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-32-opt-rustbuild, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-cross-opt, auto-win-msvc-32-opt, auto-win-msvc-64-cargotest, auto-win-msvc-64-opt, auto-win-msvc-64-opt-mir, auto-win-msvc-64-opt-rustbuild