__rune_t
__rune_t __min; /* First rune of the range */
__rune_t __max; /* Last rune (inclusive) of the range */
__rune_t __map; /* What first maps to in maps */
__rune_t (*__sgetrune)(const char *, __size_t, char const **);
int (*__sputrune)(__rune_t, char *, __size_t, char **);
__rune_t __invalid_rune;
__rune_t __maplower[_CACHED_RUNES];
__rune_t __mapupper[_CACHED_RUNES];