Re: [Haskell] How to close a type class

oleg@pobox.com writes:

Thus we have reduced the problem of excluding certain types from a typeclass to the problem of excluding all types from one particular typeclass: Fail. How can we prevent the user from adding instances to Fail?

By not exporting its name? -- __("< Marcin Kowalczyk \__/ qrczak@knm.org.pl ^^ http://qrnik.knm.org.pl/~qrczak/