#3419: Incorrect "unnecessary import" warning
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Reporter: NeilMitchell | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.10.4
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
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Changes (by simonpj):
* difficulty: => Unknown
Comment:
As it happens, the HEAD says
{{{
bash-3.2$ ~/builds/HEAD/inplace/bin/ghc-stage2 -c T3419.hs
T3419.hs:4:0:
Warning: The import of `Data.Data' is redundant
except perhaps to import instances from `Data.Data'
To import instances alone, use: import Data.Data()
}}}
but we are making an arbitrary choice here; either import can be omitted
without making the program fail to compile. Still, I don't think it's
right to say nothing here; after all, only one of those imports is needed.
Why do you think that "the current behaviour is incorrect"?.
See [wiki:Commentary/Compiler/UnusedImports] for what we've now done in
the HEAD.
Feel free to suggest specifications other than the one given there. For
example, you could say that the "home module" of an entity dominates, so
in this case pick `Data.Typeable` over `Data.Data`. That might be why your
nose twitched?
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3419#comment:1>
GHC <http://www.haskell.org/ghc/>
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