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xmonad-contrib build fails on MultiToggle.hs #563

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago 
What steps will reproduce the problem?
1.cabal install --gobal xmonad-contrib

[ 10 of 226] Compiling XMonad.Layout.MultiToggle ( 
XMonad/Layout/MultiToggle.hs, dist/build/XMonad/Layout/MultiToggle.o )

XMonad/Layout/MultiToggle.hs:162:9:
    Could not deduce (HList b w0)
      arising from the ambiguity check for ‛??’
    from the context (HList b w)
      bound by the type signature for
                 (??) :: HList b w => a -> b -> HCons a b
      at XMonad/Layout/MultiToggle.hs:162:9-42
    The type variable ‛w0’ is ambiguous
    In the ambiguity check for:
      forall a b w. HList b w => a -> b -> HCons a b
    To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
    In the type signature for ‛??’:
      (??) :: HList b w => a -> b -> HCons a b
Failed to install xmonad-contrib-0.11.2
cabal: Error: some packages failed to install:
xmonad-contrib-0.11.2 failed during the building phase. The exception was:
ExitFailure 1

What version of the product are you using? On what operating system?
Ubuntu 13.10
ghc 7.7.20131127
xmonad-contrib-0.11.2

Original issue reported on code.google.com by Ian...@gmail.com on 14 Jan 2014 at 1:20

GoogleCodeExporter commented 8 years ago 
We don't really support GHC HEAD, as it changes too rapidly and may have bugs 
accidentally introduced. If you need to use HEAD, try it with the latest 
version instead of one from November.

Original comment by allber...@gmail.com on 14 Jan 2014 at 4:28

GoogleCodeExporter commented 8 years ago 
A newer ghc HEAD isn't going to fix this (rejecting such "ambiguous types" is a 
feature not a bug). Instead build from darcs, which has a not-so-satisfactory 
fix, with a command like:

cabal install http://code.haskell.org/xmonad/xmonad.tar.gz 
http://code.haskell.org/XMonadContrib/xmc.tar.gz

Original comment by vogt.a...@gmail.com on 14 Jan 2014 at 4:51

GoogleCodeExporter commented 8 years ago 
I didn't want to commit to saying it was a HEAD bug, since I'm not keeping 
track and it *did* look like it was intended to be a feature; but such bugs 
have been known to creep in, and there's little point in pursuing further if 
it's not reproducible in the latest GHC.

Original comment by allber...@gmail.com on 14 Jan 2014 at 4:54

GoogleCodeExporter commented 8 years ago 
Issue 565 has been merged into this issue.

Original comment by vogt.a...@gmail.com on 7 Apr 2014 at 6:13

GoogleCodeExporter commented 8 years ago 
This error still exists when building the current release version of 
xmonad/xmonad-contrib with GHC 7.8.2. Is there any chance that a fix for this 
issue could be made available on Hackage?

Original comment by sim...@cryp.to on 1 May 2014 at 8:09

GoogleCodeExporter commented 8 years ago 
@ sim...@cryp.to. I originally filed the bug, and the suggested fix of 
compiling from darcs worked for me (it took a while to get around to it and I 
forgot to comment on the bug). Does it work for you?

Original comment by Ian...@gmail.com on 1 May 2014 at 8:37

GoogleCodeExporter commented 8 years ago 
Well, I can verify that adding the "ambiguous types" extension to the Cabal 
file remedies the issue.

Original comment by sim...@cryp.to on 1 May 2014 at 9:21

GoogleCodeExporter commented 8 years ago 
I uploaded 0.11.3 which has the fix we put in darcs.

Original comment by vogt.a...@gmail.com on 2 May 2014 at 1:42