Workaround for the interaction of constraints in expected
and explicit template instantiation in permissive modes
#4658
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Fixes #4657.
Works around DevCom-10652420, which is closed as Not a Bug. Works around/permissive-
.<expected>
, checkis_swappable
asis_swappable_v
can be buggy in permissive modes.<iterator>
, avoid instantiation ofcontiguous_iterator
foristreambuf_iterator
andostreambuf_iterator
, which are instantiated in locale facets.Also adds test coverage for
expected
in permissive modes.