#5860: Ambiguity between redundant imports
------------------------------+---------------------------------------------
Reporter: elliottt | Owner:
Type: feature request | Status: new
Priority: normal | Component: Compiler
Version: 7.4.1 | Keywords: module system
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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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?
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5860>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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