* @return the function value
*/
public Value callRef(String name, Value a0, Value a1,
Value a2, Value a3, Value a4)
{
AbstractFunction fun = findFunction(name);
if (fun == null)
return error(L.l("'{0}' is an unknown function.", name));
return fun.callRef(this, a0, a1, a2, a3, a4);
}