fr_srcptr
i = (*fr->fr_srcfunc)(fr->fr_srcptr, fi->fi_v, lip, fin, ifs);
fr->fr_srcptr == NULL) {
fr->fr_srcptr = fr_resolvelookup(fr->fr_srctype,
fp->fr_srcptr = fr_resolvelookup(fp->fr_srctype,
ip_lookup_deref(fr->fr_srctype, fr->fr_srcptr, ifs);