match cases in receive like in match (emtpy tuple, one item, N item tuple)
catch only allowed clauses in try/catch:

        try
            42
        catch
            case Throw: Throw
            case throw, T1: T1
            case error, E1: E1
            case exit, X1: X1
            case A, C: C
            else: iselse
        after
            43
        end