Include visibility modifier in span of foreign item

[marcusklaas]

Fixes #28472.

[rust-highfive]

r? @nikomatsakis

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[alexcrichton]

@bors: r+ e2f3e3a

cc @nrc

[bors]

⌛ Testing commit e2f3e3a with merge 4a967f8...

[bors]

💔 Test failed - auto-win-msvc-64-opt

[alexcrichton]

@bors: retry

On Sat, Sep 19, 2015 at 5:12 PM, bors notifications@github.com wrote:

[image: 💔] Test failed - auto-win-msvc-64-opt
http://buildbot.rust-lang.org/builders/auto-win-msvc-64-opt/builds/1456

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#28503 (comment).

[bors]

⌛ Testing commit e2f3e3a with merge fd38a75...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-opt