https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109337
Bug ID: 109337 Summary: c++2a test concepts4.C passes when it should fail Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: cjdb.ns at gmail dot com Target Milestone: --- Clang and GCC disagree on the validity of concepts4.C. I think Clang is correct here, because forming a reference to `void` should be ill-formed. https://godbolt.org/z/es5GxYhzd