Scm_U64VectorRef  510 ext/uvector/gauche/uvector.h extern ScmObj Scm_U64VectorRef(ScmU64Vector *vec, int index, ScmObj fallback);
Scm_U64VectorRef 3277 ext/uvector/uvlib.c SCM_RETURN(Scm_U64VectorRef(v, i, fallback));