On Thu, 19 Jul 2012, Herbert Valerio Riedel wrote:
Recently, I was a bit suprised that GHC didn't warn about useless
`where` definitions such as the following when using `-Wall` (and I
couldn't find a respective warning GHC CLI flag which would have enabled
reporting a warning in this case -- unless I missed it)
module Foo where
foo :: Int -> Int
foo n = n + 1
where
Nothing = Just n
I think that
where
x@Nothing = Just n
could be useful, if 'x' is evaluated somewhere.
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