Issue with package "pretty"

Duncan Coutts duncan.coutts at
Sun Apr 27 16:52:21 EDT 2008

On Sun, 2008-04-27 at 21:29 +0100, David MacIver wrote:

> The main thing I'd like to borrow from the Nix approach is the ability
> to back out of the package change. I'm really more bothered about the
> fact that it left me with a nonfunctioning build system (until someone
> pointed out runghc would compile everything from source) than anything
> else. :-)

Yes, that's one of its great features, that installed packages are never
modified, that you just add new ones and GC old ones.

Though in this case you didn't modify any package you just masked it. At
least I assume that's what you did. In which case the solution was to
unregister the version that was masking the normal one.


More information about the Libraries mailing list