#3419: Incorrect "unnecessary import" warning
-----------------------------+----------------------------------------------
Reporter: NeilMitchell | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.10.4 | Severity: normal
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
-----------------------------+----------------------------------------------
With the code:
{{{
{-# OPTIONS_GHC -Wall -fno-warn-missing-methods #-}
module Test where
import Data.Typeable
import Data.Data
data Test = Test
instance Typeable Test where
}}}
I get the warning:
{{{
Warning: Module `Data.Typeable' is imported, but nothing from it is
used
except perhaps instances visible in `Data.Typeable'
To suppress this warning, use: import Data.Typeable()
}}}
It seems like it's decided to pick up Typeable from Data.Data, but it's
also available from Data.Typeable which would be a better choice. I'm not
sure how this should be solved, but the current behaviour seems incorrect.
Perhaps if two modules are imported, both of which export the same thing,
they should both be allowed.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3419>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler_______________________________________________
Glasgow-haskell-bugs mailing list
Glasgow-haskell-bugs@haskell.org
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
