Proposal: Remove the bogus MonadFail instance for ST - Libraries - Haskell.org

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Proposal: Remove the bogus MonadFail instance for ST

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David Feuer

13 Mar 2018 13 Mar '18

11:45 p.m.

I just noted that ST is an instance of MonadFail, with fail throwing an error. This seems utterly contrary to the purpose of MonadFail! Can we please remove this instance? David Feuer

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Andrew Martin

14 Mar 14 Mar

6:44 a.m.

+1 on removing it. Sent from my iPhone

On Mar 13, 2018, at 11:45 PM, David Feuer wrote:

I just noted that ST is an instance of MonadFail, with fail throwing an error. This seems utterly contrary to the purpose of MonadFail! Can we please remove this instance?

David Feuer _______________________________________________ Libraries mailing list Libraries@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/libraries

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Michael Snoyman

9:44 a.m.

+1, this seems like a good move to me. On Wed, Mar 14, 2018 at 5:45 AM, David Feuer wrote:

I just noted that ST is an instance of MonadFail, with fail throwing an error. This seems utterly contrary to the purpose of MonadFail! Can we please remove this instance?

David Feuer _______________________________________________ Libraries mailing list Libraries@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/libraries

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Andrew Martin
David Feuer
Michael Snoyman