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dmalikov/after.hs

Created July 28, 2013 13:20
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nice module-management package
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after.hs
import Control.Monad (($), forM, undefined)
main = forM [] $ undefined
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before.hs
import Control.Monad (forM, forM_)
main = forM [] $ undefined
@dmalikov
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$> :m + Language.Haskell.Modules.Imports Language.Haskell.Modules.Params
$> runCleanT $ cleanImports ["before.hs"]

@ddssff
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ddssff commented Jul 30, 2013

Believe it or not, this is a bug in GHC. If you run

ghc -c -ddump-minimal-imports before.hs

on the file before.hs, you will see this in Main.imports:

import Control.Monad ( ($), undefined, forM )

Here is the GHC ticket for this issue, it should be fixed in 7.8 but in the meantime just add a module line or amything else above the first import:

http://ghc.haskell.org/trac/ghc/ticket/7476

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