To that end, I've got an example for firing up a little Cabal project and using a sandbox for the dependencies here: http://howistart.org/posts/haskell/1 The short version: mkdir project && cd project && cabal sandbox init && cabal install vector && cabal repl Hope this helps, Chris On Thu, May 28, 2015 at 4:01 PM, Brandon Allbery wrote:

On Wed, May 27, 2015 at 4:15 AM, Dananji Liyanage wrote:

...

<interactive>:41:18: Couldn't match expected type ‘Data.Vector.Vector a’ with actual type ‘vector-0.10.9.1:Data.Vector.Vector Int’ NB: ‘Data.Vector.Vector’ is defined in ‘Data.Vector’ in package ‘vector-0.10.12.3’ ‘vector-0.10.9.1:Data.Vector.Vector’ is defined in ‘Data.Vector’ in package ‘vector-0.10.9.1’

Did you read the message? It is telling you that you have two versions of the vector package installed, and it is unable to reconcile them.

You should likely remove one of them --- and in the future use sandboxes so that you can avoid this kind of conflict.

-- brandon s allbery kf8nh sine nomine associates allbery.b@gmail.com ballbery@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net

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