// and is consulted to avoid bugs where a symbol is put on a list
// twice.
func (l *Loader) AttrOnList(i Sym) bool {
	return l.attrOnList.Has(i)
}

// SetAttrOnList sets the "on list" property for a symbol (see
// AttrOnList).
func (l *Loader) SetAttrOnList(i Sym, v bool) {
	if v {
		l.attrOnList.Set(i)
	} else {
		l.attrOnList.Unset(i)
	}
}

		rsym := r.Sym()
		rst := d.ldr.SymType(rsym)

		// Look for abstract function references.
		if rst == sym.SDWARFABSFCN {
			if !d.ldr.AttrOnList(rsym) {
				// abstract function
				d.ldr.SetAttrOnList(rsym, true)
				unit.AbsFnDIEs = append(unit.AbsFnDIEs, sym.LoaderSym(rsym))
				d.importInfoSymbol(rsym)
			}
			continue
		}

		// Look for type references.