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Erwan Auer authored
With GHC 8.6, [the option -XMonadFailDesugaring is enabled by default](https://ghc.haskell.org/trac/ghc/wiki/Migration/8.6#MonadFailDesugaringbydefault), causing partial pattern matches in `do`-statement to desugar with the `fail` method from the `MonadFail` class. * src/VMMonad.hs: here.
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