Re: [Haskell-cafe] Curious why "cabal upgrade parsec" not installing latest version

Thomas, Ivan, Thanks much for the info. -- Peter On Wed, Sep 15, 2010 at 8:00 PM, Ivan Lazar Miljenovic wrote:

On 16 September 2010 12:47, Peter Schmitz wrote:

...

Not that I'm having any problem with parsec 2.1.0.1, but I guess I would like to install the latest (3.1.0), unless there is a reason not to.

Because Parsec-3 apparently still has some speed regressions compared to Parsec-2 (I'm not qualified to note whether its design is slow or if you have to use it differently to get good performance out of it), so many developers prefer to stick to Parsec-2 for this reason.

As such, and because a lot of Cabal files just state "parsec" without a dependency, by default cabal-install will assume that an unversioned dependency (which includes installing/upgrading it via the command line) refers to Parsec-2 and not Parsec-3.

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com IvanMiljenovic.wordpress.com