thanks, it seems to be fine now. On Tue, Nov 2, 2010 at 5:04 PM, Daniel Fischer wrote:

On Wednesday 03 November 2010 00:46:13, Michael Litchard wrote:

...

Here's what cabal says I have installed

* parsec     Synopsis: Monadic parser combinators     Latest version available: 3.1.0     Latest version installed: 2.1.0.1     Homepage: http://www.cs.uu.nl/~daan/parsec.html     License:  BSD3

but here is what happens when I try to upgrade

cabal upgrade parsec Resolving dependencies... No packages to be installed. All the requested packages are already installed. If you want to reinstall anyway then use the --reinstall flag. mlitchard@kether:~/projects/perf/autoperf/session_creator$

Any clues as to what I can try next to fix things would be appreciated.

$ cabal install parsec-3.1.0

There's a preferred version constraint on parsec, so by default cabal installs parsec-2 rather than parsec-3, you have to tell it explicitly to install parsec-3. It might be necessary to tell cabal to use parsec-3 also when installing other packages that depend on parsec,

$ cabal install --constraint="parsec == 3.1.0" whatever

should do the trick then (if it doesn't use the --preference flag instead of --constraint).