[Bug c/89180] [meta-bug] bogus/missing -Wunused warnings

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89180
Bug 89180 depends on bug 107791, which changed state.

Bug 107791 Summary: Spurious -Wunused warning for artificial variable introduced for post contract
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107791

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED