ghc7 typing problem
Christian.Maeder at dfki.de
Mon Oct 25 08:09:40 EDT 2010
Again thanks, it works with ghc 7.1.20101024
Am 18.10.2010 18:16, schrieb Simon Peyton-Jones:
> Thanks. We knew about this -- in flight changes happening now -- but I've added it as a new regression test even so.
> | -----Original Message-----
> | From: Christian Maeder [mailto:Christian.Maeder at dfki.de]
> | Sent: 15 October 2010 17:53
> | To: GHC Users Mailing List
> | Cc: Simon Peyton-Jones
> | Subject: ghc7 typing problem
> | Hi,
> | I've looked at:
> | http://hackage.haskell.org/trac/ghc/blog/LetGeneralisationInGhc7
> | but still have a problem with the attached program that fails with:
> | GHCi, version 7.1.20101010: http://www.haskell.org/ghc/ :? for help Loading package
> | ghc-prim ... linking ... done.
> | Loading package integer-gmp ... linking ... done.
> | Loading package base ... linking ... done.
> | Loading package ffi-1.0 ... linking ... done.
> | [1 of 1] Compiling Main ( HasKey.hs, interpreted )
> | HasKey.hs:17:10:
> | Couldn't match type `key' with `key1'
> | because this skolem type variable would escape: `key1'
> | This skolem is bound by the instance declaration
> | In the instance declaration for `Ord (Keyed x)'
> | at the final instance for Ord.
> | The original code comes from
> | http://hackage.haskell.org/packages/archive/uni-util/188.8.131.52/doc/html/Util-
> | VariableSet.html
> | Cheers Christian
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