https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85841
--- Comment #4 from janus at gcc dot gnu.org --- The diagnostics for the deleted features have been implemented in r260433. As a minor follow-up, one should get rid of the GFC_STD_F2008_TS macro and make -std=f2008ts an alias for -std=f2018.