mikecrowe added a comment. Despite the fact that I've worked on what became this check for about two years, now that it's landed I've suddenly spotted a significant flaw: `printf` returns the number of characters printed, whereas `std::print` doesn't return anything. None of my test cases made use of the return value. I think this means that I need to only match on calls that don't make use of the return value. I shall try to do that.
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