Update E0297 to new error format

[jfirebaugh]

Fixes #35521.
Part of #35233.

I didn't attempt the bonus of narrowing the span to focus on the "for <pattern>" piece (it's my first time contributing), but I'm happy to do so given some hints.

r? @jonathandturner

[rust-highfive]

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[GuillaumeGomez]

Thanks!

@bors: r+ rollup

[bors]

📌 Commit f647db4 has been approved by GuillaumeGomez

[bors]

⌛ Testing commit f647db4 with merge 1e0dbbe...

[bors]

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

[alexcrichton]

@bors: retry

On Sat, Sep 10, 2016 at 6:07 PM, bors notifications@github.com wrote:

💔 Test failed - auto-mac-64-opt-rustbuild
https://buildbot.rust-lang.org/builders/auto-mac-64-opt-rustbuild/builds/2434

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[jfirebaugh]

@GuillaumeGomez Can I get write access to the issue tracker? I'd like to do some gardening, closing out all the "EXXXX needs to be updated to new format" issues that have in fact been already fixed. There seem to be quite a few, and it's cluttering up the E-Easy label for folks looking for something to contribute.

[GuillaumeGomez]

I'm not the one you should ask, ask @steveklabnik.

[sophiajt]

@jfirebaugh - my bad. I've gone through and closed the ones that are already finished.