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Notice that because Holder<Incomplete> is _possible_ to complete, but _unsafe_ to complete, that means that Holder<Incomplete>* is basically not an iterator and it's not even safe to ask if input_iterator<Holder<Incomplete>*> because that _will_ necessarily complete the type. So it's totally expected that we still cannot safely ask e.g. static_assert(std::indirect_unary_predicate<bool(&)(Holder<Incomplete>&), Holder<Incomplete>*>); or even static_assert(!std::indirect_unary_predicate<int, Holder<Incomplete>*>); This was originally uploaded as https://reviews.llvm.org/D119029 and I picked it up here as part of the Github PR transition. Co-authored-by: Arthur O'Dwyer <arthur.j.odwyer@gmail.com>