https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97930
Bug ID: 97930 Summary: pair is not a structural type Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: stinkingmadgod at gmail dot com Target Milestone: --- template<std::pair<int, int>> struct S; This is valid in C++20, but fails due to libstdc++ using a private base __pair_base, rendering pair non-structural. [pairs.pairs] pair<T, U> is a structural type if T and U are both structural types.