[PATCH] D94769: [Support] Format provider improvements

[Vladislav Vinogradov via Phabricator via llvm-commits]

vinograd47 added a comment.

@sammccall Could we have some agreement? As I mentioned in the last comment, even while `has_StreamOperator` checks for const correct version of `operator <<` with streams, `formatv` implementation can call non-const version if it is available due to perfect forwarding.


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https://reviews.llvm.org/D94769