[Haskell-cafe] RebindableSyntax and fail in GHC 8

Chris Smith cdsmith at gmail.com
Tue Dec 20 08:53:53 UTC 2016

Hey everyone,

Can someone explain to me by GHC 8 causes list comprehension bindings to
desugar to use 'fail', when RebindableSyntax is enabled in GHC 8?  Note
that I do not have monad comprehensions enabled.  If I define fail,
everything works (apparently regardless of what I define fail to do?!?),
but I'd like to understand why it's necessary.

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