A. Jiang 496f2ef087
[libc++][test] Move the SFINAE test for return types of quoted to libcxx/test/libcxx/ (#157026)
[quoted.manip] only specifies that `operator<<`/`operator>>` is
well-formed for operands with suitable types, and leaves it undefined
whether they are SFINAE-friendly.

Although it's worthwhile making them SFINAE-friendly, perhaps the
SFINAE-friendliness should be considered as a libc++-specific choice at
this moment.

See LWG4364 for whether this should be considered portable.
2026-01-13 14:41:28 +00:00
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