https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63651
--- Comment #4 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> --- (In reply to Dominique d'Humieres from comment #3) > Does it means that 'id' should be replaced with 'instancetype' in failing > tests? What about the gnu-runtime? No, we need to make the compiler understand 'instancetype'.