--- Comment #4 from cyp561 at gmail dot com ---
Is there any case in which a function returning a structure may not elide the
return value copy to being passed by invisible reference?

If not, I think it is either a bug that the code fails, or a bug that the C++
frontend allows __attribute__((__const__)) on any function which returns a

It seems strange to me that __attribute__((__const__)) doesn't work in cases
where constexpr does work, since I thought constexpr is a now-standard version
of __attribute__((__const__)).

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