rnk added a comment. I think what I said applies to your test case. Basically, in the Itanium C++ ABI, virtual method definitions provide all their thunks as `weak_odr`. We only emit thunks referenced by vtables as an optimization, and they are marked `available_externally`. In your test case, we hit the early return that I linked to, so we don't try to clone, and we don't need to emit an error.
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