Scm_StringPointerSubstring 2224 src/extlib.c    SCM_RESULT = (Scm_StringPointerSubstring(sp, !SCM_FALSEP(after)));
Scm_StringPointerSubstring 1210 src/gauche.h   SCM_EXTERN ScmObj Scm_StringPointerSubstring(ScmStringPointer *sp, int beforep);