https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102208
Bug ID: 102208 Summary: Acceptance of invalid decltype(auto) in the default operator <=> Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: fchelnokov at gmail dot com Target Milestone: --- GCC accepts invalid: ``` struct A { decltype(auto) operator <=>(const A &) const = default; }; ``` https://gcc.godbolt.org/z/h1xxboGa9 The correct program must have simply `auto`: ``` struct A { auto operator <=>(const A &) const = default; }; ```