Document if mut is UB about ut HOT 3 CLOSED

In fact I will close it, since I presume this is resolve. :)

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It isn't UB as used in the examples. That said, mut is much too powerful. I would stick to specifying the lambda as mutable if all you need is to modify a lambda's capture for a test (as opposed to non-testing uses, as mutable affects all captures, which might have unintended consequences. See https://wg21.link/P2034).

from ut.

Apologies, this is all very weird to me, but you are right, I always assumed that writing to any const object is UB, unless it was a const ref to something that was originally mutable.

Feel free to close this issue.

from ut.