Quuxplusone added a comment. As you're making tests for ADL corner cases, you might also consider testing the interactions between ADL and defaulted function parameters, e.g. https://godbolt.org/z/vHnyFl It looks like everyone (except MSVC) already gets that stuff right (or at least portable-between-the-big-three). I bet the behavior naturally falls out of some other rules; you might say "there's no way that could possibly break, so we don't need to test it," and I'd accept that.
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