rjmccall added a comment. The correctness condition here is solely that we cannot allow the block literal to go out of scope before the variable that it is assigned to. (Local block literals with captures have lifetimes like C compound literals: until the end of the enclosing block, rather than the end of the full-expression.) So doing this blindly for assignments is problematic because you'd need to reason about relative lifetimes, but doing it for initialization should always be fine. I don't see any reason why address-taken-ness would matter as long as that condition holds.
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