[Hat] Hat bug report: Ambiguous occurrence `List'
Bernard James POPE
bjpop at cs.mu.OZ.AU
Tue Jun 22 05:26:53 EDT 2004
On Mon, Jun 21, 2004 at 05:48:09PM -0700, Fergus Henderson wrote:
> I am trying to get Hat working on a reasonably large and complicated project.
> Unfortunately it doesn't work. I have cut down the code which triggers the
> problem to the following simple test case:
> | bash$ cat Foo/List.hs
> | module Foo.List where
> | class List a b where
> | foo :: a -> b
> | main :: IO ()
> | main = return ()
> | bash$ hmake -hat Foo/List
> | hat-trans Foo/List.hs
> | Creating directories Hat Hat/Foo
> | Wrote Hat/Foo/List.hs
> | /usr/bin/haskell-compiler -c -package hat -o Hat/Foo/List.o Hat/Foo/List.hs
> | Hat/Foo/List.hs:1:
> | Ambiguous occurrence `List'
> | It could refer to either `Hat.Hat.List', imported from Hat.Prelude at Hat/Foo/List.hs:30
> | or `Hat.Foo.List.List', defined at Hat/Foo/List.hs:32
> I am using hat-2.02.8 with ghc 6.2 on Debian Linux.
As a temporary fix, that _might_ get you past this bug, you can modify the
file Hat/Foo/List.hs to say:
import Hat.Prelude hiding (List)
on about line 30.
There might be cases where this fails to fix the problem though.
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