SCM_CHARSET_LOWER  815 src/char.c                 return Scm_GetStandardCharSet(SCM_CHARSET_LOWER);
SCM_CHARSET_LOWER  861 src/char.c             if (islower(code)) MASK_SET(CS(SCM_CHARSET_LOWER), code);
SCM_CHARSET_LOWER  923 src/gauche.h       SCM_CHARSET_LOWER,