#3420: Missing warning on duplicate import
-----------------------------+----------------------------------------------
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
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The following program does not give a warning:
{{{
{-# OPTIONS_GHC -Wall #-}
import Data.List
import Data.List
main :: IO ()
main = print $ sort "hello"
}}}
But this program does:
{{{
{-# OPTIONS_GHC -Wall #-}
import Data.List(sort)
import Data.List
main :: IO ()
main = print $ sort "hello"
}}}
with:
{{{
Warning: Redundant import of: `sort'
It is also imported from Data.List at Test.hs:4:0-15
}}}
It seems surprising that 100% identical imports aren't given as warnings,
as in the first example.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3420>
GHC <http://www.haskell.org/ghc/>
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