[ ghc-Bugs-1162969 ] Over-zealous dup-import warning

Bugs item #1162969, was opened at 2005-03-14 12:56
Message generated for change (Settings changed) made by simonpj
You can respond by visiting: 
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Category: Compiler
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 4
Submitted By: Simon Peyton Jones (simonpj)
Assigned to: Simon Peyton Jones (simonpj)
Summary: Over-zealous dup-import warning

Initial Comment:
Pointed out by John Meacham [john <at> repetae.net]

In 6.4 the duplicate import warning seems to be 
triggered overzealously, even
when one import is qualified and the other isn't.

import qualified Data.Map 
import Data.Map(Map)

foo :: Map Int Int
foo = Data.Map.empty

main = do
    print foo

produces:
 Foo.hs:1:0:
    Warning: `Map' is imported more than once:
               imported from Data.Map at Foo.hs:3:16-18
               imported from Data.Map at Foo.hs:2:0-24

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>Comment By: Simon Peyton Jones (simonpj)
Date: 2005-05-03 13:12

Message:
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OK, I've fixed this.  I've changed the message to focus on 
each import and report if it is redundant; that is, is completely 
covered by another import. (Instead of reporting on some 
overlap, in a symmetrical way.)

I hope this should be a big improvement; let me know if not.

Simon

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Comment By: Fergus Henderson (fergus)
Date: 2005-04-12 23:06

Message:
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Yes, this one is a pain -- it would be great if someone
would fix this.
The only work-around I have at the moment is to use "-Wall
-fno-warn-unused-imports" instead of "-Wall".
   - Fergus Henderson.

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