[PATCH][RFC] Add quotes for constexpr keyword.

[Martin Liška]

On 11/06/2017 07:29 PM, Martin Sebor wrote:
> Sorry for being late with my comment.  I just spotted this minor
> formatting issue.  Even though GCC isn't (yet) consistent about
> it the keyword "constexpr" should be quoted in the error message
> below (and, eventually, in all diagnostic messages).  Since the
> patch has been committed by now this is just a reminder for us
> to try to keep this in mind in the future.

Hi.

I've prepared patch for that. If it's desired, I can fix test-suite follow-up.
Do we want to change it also for error messages like:
"call to non-constexpr function"
"constexpr call flows off the end of the function"

Thanks,
Martin
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