MFP updates: ideas worth discussing

[Marcin Mrotek]

Hello,

Are people actually using the string argument for anything else than
throwing an error message into the user's face? (I've always seen Either
String as a bit of a hack)? If not, I think it would be best to leave fail
to errors (as in IO), and desugar failed pattern matches to mempty/empty
instead.

Best regards,
Marcin Mrotek
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