using System; sealed class ClaseSellada { } class NuevaClase : ClaseSellada { }
Standard input is empty
prog.cs(7,7): error CS0509: `NuevaClase': cannot derive from sealed type `ClaseSellada' prog.cs(3,14): (Location of the symbol related to previous error) Compilation failed: 1 error(s), 0 warnings
Standard output is empty