Changes between Version 18 and Version 19 of Proposals/transformers
- Timestamp:
- 11/05/10 09:45:01 (3 years ago)
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Proposals/transformers
v18 v19 107 107 108 108 ''Could not deduce (Functor m) from the context (Monad m)'' 109 This will be in a situation where you're using a monad constructed with a transformer as a Functor. You can replace the {{{Monad m}} with {{{Functor m}}}. Alternatively, if you add a {{{Functor m}}} constraint it willwork with old and new versions of mtl.109 This will be in a situation where you're using a monad constructed with a transformer as a Functor. If this is triggered by a use of {{{fmap}}}, you can replace it with {{{liftM}}} and the code will build with old and new versions of mtl. Alternatively, you can replace the {{{Monad m}}} with {{{Functor m}}} to make it work with mtl-2, or add a {{{Functor m}}} constraint to make it work with old and new versions of mtl. 110 110 111 111 ''Not in scope: data constructor State''
