__key             147 maint/gnulib/lib/argp.h typedef error_t (*argp_parser_t) (int __key, char *__arg,
__key             263 maint/gnulib/lib/argp.h   char *(*help_filter) (int __key, const char *__text, void *__input);
__key             619 maint/gnulib/lib/argp.h       int __key = __opt->key;
__key             620 maint/gnulib/lib/argp.h       return __key > 0 && __key <= UCHAR_MAX && isprint (__key);