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 nI 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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