Incorrect unused-import warning in ghci
Try to load the following in ghci with -fwarn-unused-imports:
import Prelude hiding (zip)
zip :: [a] -> [b] -> [(a,b)]
zip _ _ = []
It spits out the usual warning for unused imports:
Warning: The import of `Prelude' is redundant
except perhaps to import instances from `Prelude'
To import instances alone, use: import Prelude()
When compiled with ghc --make -fwarn-unused-imports
no warning is printed. Also, the following does not generate a warning in ghci:
import Prelude hiding (zip)
zip :: [a] -> [b] -> [(a,b)]
zip _ _ = undefined
I expect ghci and ghc to agree on the warnings unless there's a good reason not to, and I do not expect warnings about declarations to depend on their implementation.
Trac metadata
Trac field | Value |
---|---|
Version | 6.12.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | GHCi |
Test case | |
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