Scm_CharSetAdd    744 src/char.c                 Scm_CharSetAdd(set, SCM_CHARSET(moreset));
Scm_CharSetAdd    749 src/char.c                 Scm_CharSetAdd(set, SCM_CHARSET(moreset));
Scm_CharSetAdd   1471 src/extlib.c   SCM_RESULT = Scm_CharSetAdd(dst, src);
Scm_CharSetAdd    906 src/gauche.h   SCM_EXTERN ScmObj Scm_CharSetAdd(ScmCharSet *dest, ScmCharSet *src);