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I have double checked by grepping for the error message and it looks like we still don't have any similar tests in miri.

Yeah, we probably mostly test this via const-eval tests... but can't hurt to also have a Miri test for this.

@rustbot author

Reminder, once the PR becomes ready for a review, use @rustbot ready.

So, having looked into this more closely, there's already a quite comprehensive rustc test for this at tests/ui/consts/const-eval/ub-enum.rs, not sure if duplicating it makes sense...

Having at least a sort of smoke test also in Miri does make sense I think.

Okay, I've switched it over to a transmute and added a comment to note where the more comprehensive tests can be found.

@rustbot ready

Thanks!