[PATCH] D57058: Implement LWG3101 - span's Container constructors need another constraint

[Louis Dionne via Phabricator]

ldionne accepted this revision.
ldionne added a comment.
This revision is now accepted and ready to land.

LGTM, thanks for the explanation re: the test.


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  https://reviews.llvm.org/D57058/new/

https://reviews.llvm.org/D57058