https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68722
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> --- I wonder if in such cases, where we run out of tokens and we issue: error_at (token->location, "file ends in default argument"); from cp_parser_cache_defarg we should instead use something like a fatal_error and stop the meaningless chain of redundant errors. Certainly that avoids the error recovery ICE at issue and passes testing...
