Report unused pattern bindings
Henning says: 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 there should be a warning for the unused pattern binding.
Trac metadata
Trac field | Value |
---|---|
Version | 7.4.2 |
Type | FeatureRequest |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
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Blocking | |
CC | |
Operating system | |
Architecture |