nem.cs

mutable adders;
c.Scope.FindMany(s => true, ref adders);
              
foreach (adder in adders) {
  def parms = adder.ParameterScope
                   .GetSymbols()
                   .OfType.[FormalParameterSymbol]()
                   .ToArray();
  
  when (parms.Length != 1) continue;
  
  when (adderType.IsDescendant(parms[0].Type))
    return Some(adder)
}