stable features lint warning mentions version stabilized

[zackmdavis]

To accomplish this, we alter the checks in rustc::middle::stability to
use the StabilityLevel defined in syntax::attr (which includes the
version in which the feature was stabilized) rather than the local
StabilityLevel in the same module, and make the
declared_stable_lang_features field of
syntax::feature_gate::Features hold a Vec of feature-name, span
tuples (in analogy to the declared_lib_features field) rather than
just spans.

Fixes#33394.

r? @brson (tagging Brian because he wrote the lint)

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @brson (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 Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed.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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[Aatch]

I slightly edited your issue to read "Fixes #33394", so Github will close the relevant issue automatically.

[brson]

@bors r+

[bors]

📌 Commit 06c9e0f has been approved by brson

[bors]

⌛ Testing commit 06c9e0f with merge 8bb86da...

[bors]

💔 Test failed - auto-linux-64-opt-rustbuild

[alexcrichton]

@bors: retry

On Tue, May 31, 2016 at 3:50 PM, bors notifications@github.com wrote:

💔 Test failed - auto-linux-64-opt-rustbuild
http://buildbot.rust-lang.org/builders/auto-linux-64-opt-rustbuild/builds/1300

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