https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64129
--- Comment #2 from Dmitry G. Dyachenko <dimhen at gmail dot com> --- (In reply to Jonathan Wakely from comment #1) > > Please submit a full bug report, > > with preprocessed source if appropriate. > > Please include the complete backtrace with any bug report. > > See <http://gcc.gnu.org/bugs.html> for instructions. Hmmm... testcase is in the beginning of the description... $ cat x.ii template <0> int __copy_streambufs_eof; class { friend __copy_streambufs_eof <> (