https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88951
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> --- Also note, further clarifying what I said in the linked messages, that we only temporarily, for few releases, accepted with -fpermissive such kind of broken code: before gcc5, -fpermissive suppressed the first error, but then an additional hard error was emitted anyway.
