https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110917
--- Comment #2 from Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> --- > Alternatively, we could replace the contiguous_iterator<_OutIter> constraint > with constructible_from<span<_CharT>, _OutIter, iter_difference_t<_OutIter>>. I think `is_same` is preferable to `constructible_from<...>` just because it's simpler; I wouldn't recommend the hairier thing unless there was a known reason for it. Doing the hairier thing would immediately trigger a search for the corner case where it would fail. ;) (Suppose the author of _OutIter arranges that sentinel_for<size_t, _OutIter> — maybe that'd do the trick...) Btw, even though my reduced test case was contrived, it originates from an actually realistic use-case AFAIK: using `format` to format ASCII text automatically into an array of char16_t or char32_t (presumably on a platform with unsigned plain char).
