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The resolution of CWG issue 1321 clarified that when deciding whether two expressions involving template parameters are equivalent, two dependent function calls where the function is named with an unqualified-id are considered to be equivalent if the name is the same, even if unqualified lookup finds different sets of functions. We were wrongly treating qualified-ids the same way, so that EXISTS and test::EXISTS were considered to be equivalent even though they are looking up the name in different scopes. This also causes a mangling bug, but I don't think it's safe to fix that for GCC 10; this patch just fixes the comparison. gcc/cp/ChangeLog 2020-03-30 Jason Merrill <jason@redhat.com> PR c++/90711 * tree.c (cp_tree_equal) [CALL_EXPR]: Compare KOENIG_LOOKUP_P. (called_fns_equal): Check DECL_CONTEXT.
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