#1911: -w doesn't turn off nullModuleExport
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Reporter: AndreaRossato | Owner: AndreaRossato
Type: bug | Status: assigned
Priority: normal | Milestone: 6.10 branch
Component: Compiler | Version: 6.8.1
Severity: minor | Resolution:
Keywords: | Difficulty: Easy (1 hr)
Testcase: | Architecture: Multiple
Os: Multiple |
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Comment (by AndreaRossato):
Hi Neil,
I don't think I entirely understand your message. Here warn-unused-imports
is off by default, that is to say, I need to use -fwarn-unused-imports to
have the warning reported.
And, more important, it's use seems to be unrelated to the
nullModuleExport, which is always reported when a module exports a second
module which (the second) does not export anything.
To explain:
1. Module A:
module A ( module B ) where
import module B
Module B:
module B where
Compiling A reports a waring:
A.hs:1:11: Warning: The export item `module B' exports nothing
This warning is not suppressed by "-w". And it is unrelated to -fno-warn-
unused-imports, since A is actually using the export.
Am I missing something?
Both this one and the one reported by Simon are generated by the renamer
and indeed there are no checks for flags.
(In the meantime I'm preparing the list of unflagged warnings and reading
this wiki for preparing a patch that complies with the style and the
guidelines for contributors - which is a useful reading anyhow).
Andrea
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1911#comment:6>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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