#4983: Warning about redundant import is wrong when hiding identifiers in order
to
avoid export ambiguities
------------------------------------------------+---------------------------
Reporter: Lemming | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Compiler | Version: 7.0.1
Resolution: wontfix | Keywords:
Testcase: | Blockedby:
Difficulty: | Os:
Unknown/Multiple
Blocking: | Architecture:
Unknown/Multiple
Failure: Incorrect warning at compile-time |
------------------------------------------------+---------------------------
Comment(by Lemming):
Replying to [comment:2 simonpj]:
> I think Lemming's complaint is that the error message isn't right. We
don't want to import instances, but we still need `import Prelude ()`. So
the suggestion is right but the reason is wrong.
Maybe this confused me and let me think that GHC is broken.
My problem was, that I was not aware, that I did not use something from
Prelude.
Usually I use variables from Prelude without noting it.
Maybe you can just alter the warning to:
{{{
src/Data/Monoid/HT.hs:6:1:
Warning: You imported `Prelude', but used nothing of it,
except perhaps instances from `Prelude'
To import instances alone, use: import Prelude()
}}}
I remember that I have already seen such warnings from GHC (I mean: "used
nothing of it"), but I do not know in what cases GHC emits them.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4983#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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