[Haskell-cafe] don't: a 'do' for comonads?

[Donald Bruce Stewart]

As seen on #haskell, from an idea by Malcolm,

    14:42  ?let top'n'tail = ("<pre>"++) . (++"</pre>") 
    14:42  lambdabot> Defined.
    14:43  dons> > L.top'n'tail "foo me now"
    14:43  lambdabot>  "<pre>foo me now</pre>"
    14:43  mauke> that reminds me, haskell needs don't
    14:43  dons> yes!
    14:44  pkhuong-> mm. the opposite of do, eh? do for comonads? :)

So now a prize to the person who comes up with the best use for the
identifier:

    don't :: ?

-- Don