Alias for :quit in GHCi?

[Juanma Barranquero]

Trivial question, just out of curiosity.

Why it is not possible to define aliases for :quit in GHCi?

 Prelude> :def ayuda \_ -> return ":help"
 Prelude> :def adios \_ -> return ":quit"
 Prelude> :ayuda
    ... normal help output...
 Prelude> :adios
 Prelude>

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                    /L/e/k/t/u