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duplicate_decls assumed that any TREE_ARTIFICIAL function at namespace scope was a built-in function, but now in C++20 it's possible to have an implicitly declared hidden friend operator==. We just need to move the assert into the if condition. gcc/cp/ChangeLog 2020-04-06 Jason Merrill <jason@redhat.com> PR c++/94462 * decl.c (duplicate_decls): Fix handling of DECL_HIDDEN_FRIEND_P.
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