You're right. That's a good case for a feature request.
In fact any binding that binds no variables should be warned about:
let Just _ = ...
Cheers Christian
Am 19.07.2012 12:50, schrieb Herbert Valerio Riedel:
Hello,
Recently, I was a bit suprised that GHC didn't warn about useless
`where
In your case the Nothing is unused so will never be a problem.
Perhaps more worrying:
foo :: Int -> Int
foo n = x + 1
where
Just x = Nothing
This gives no warnings.
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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 -- u
Hello,
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
