fail is not a (visible) method of class ‘Monad’

[svenssonjoel]

YamlReference> Building library for YamlReference-0.10.0..
YamlReference> [1 of 1] Compiling Text.Yaml.Reference
YamlReference>
YamlReference> /tmp/stack-1699d85c47253409/YamlReference-0.10.0/Text/Yaml/Reference.hs:713:3: error:
YamlReference> ‘fail’ is not a (visible) method of class ‘Monad’
YamlReference> |
YamlReference> 713 | fail message = Parser $ \ state -> failReply state message
YamlReference> | ^^^^
YamlReference>

[orenbenkiki]

Fail is not a method of class Monad??? Unlikely...

A quick search found this: https://gitlab.haskell.org/ghc/ghc/-/issues/16849

Could it be that you are running some alpha version of GHC/Prelude/something?

Edit: Looking at https://hackage.haskell.org/package/base-4.9.0.0/docs/Control-Monad-Fail.html - is there some breaking change where Monad is no longer a MonadFail?