[PATCH] Warning on unevaluated expression contexts with side effects

[Aaron Ballman]

On Wed, Dec 17, 2014 at 10:37 PM, Richard Trieu <rtrieu at google.com> wrote:
> I am seeing a lot of new diagnostics from the evaluated in a typeid warning.
> I think that it should be split off to its own sub-group.

How about something like the attached patch? It goes a bit further and
gives control over both potentially evaluated and unevaluated
expression contexts, while keeping it part of -Wunused-value.

~Aaron
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