Commit 2f03b216 authored by Bruno BELANYI's avatar Bruno BELANYI

vmmonad: add backwards-compatible MonadFail compliance

The `fail` method on `Monad` has been removed in `ghc` 8.8+, I added a
conditional compilation statement according to what was indicated in the
following wiki article:
<https://gitlab.haskell.org/ghc/ghc/wikis/proposal/monad-fail#adapting-old-code>

* src/VMMonad.hs: Here.
parent eae0f88e
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