https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92224

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Also, set keys are *not* const, otherwise you wouldn't be able to assign one
set to another set without reallocating every element.

std::set<T>::iterator only gives you const *access* to the elements, but the
elements themselves are not actually const.

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