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Some libstdc++ tests were failing with import std because ADL didn't find rethrow_exception, even though it's a friend. The problem turned out to be because it's not in the same namespace, and in C++17 ADL only makes hidden friends visible. But in C++20 P1787 changed [basic.lookup.argdep]/4.2 to directly include all friends in the lookup. Note that my change still excludes class members, even though the standard doesn't specify that; including implicit object member functions would just break, and even foreign static/xobj member functions seem like they would be strange to include. gcc/cp/ChangeLog: * name-lookup.cc (name_lookup::adl_class_fns): Include all namespace-scope friends. gcc/testsuite/ChangeLog: * g++.dg/lookup/koenig16.C: New test.
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