Ambiguity between redundant imports
GHC reports this program:
module Test where
import Data.ByteString (ByteString)
import qualified Data.ByteString as S
test :: ByteString -> ByteString
test x = x
as having a redundant import of Data.!ByteString:
$ ghc -c -Wall Test.hs
Test.hs:4:1:
Warning: The import of `Data.ByteString' is redundant
except perhaps to import instances from `Data.ByteString'
To import instances alone, use: import Data.ByteString()
However, removing the restricted import of Data.!ByteString will cause the program to fail to compile, as the type is no longer available. The real problem is with the qualified import of Data.!ByteString as S that is never referenced in the program.
Would it be possible to change the message to distinguish between the qualified import an the restricted import, by more than the line number?
Trac metadata
Trac field | Value |
---|---|
Version | 7.4.1 |
Type | FeatureRequest |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |