https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90196

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The warning works as intended. Types with a non-trivial destructor do not cause
a warning, because if the destructor has side effects then the variable is not
unused. We don't want to warn for types like std::lock_guard which are
constructed and then not "used", because the destructor does all the useful
work.

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