Am Montag 21 September 2009 16:21:10 schrieb aditya siram:

Hi all, I am trying out the awesome Vacuum Cairo package on GHC 6.10.3 but I am

getting some interesting errors. The following works in GHCI:

...

view [1 .. 3]

But the following does not work in GHCI:

...

let x = [1 .. 3] view x

or,

...

x <- return [1 .. 3] view x

For the last two I get: context: "(:)|0" -> >>> {"1|1", <<< "(:)|2"} ghc: ../../src/xcb_lock.c:77: _XGetXCBBuffer: Assertion `((int) ((xcb_req) - (dpy->request)) >= 0)' failed. Aborted

and GHCI quits.

Any ideas? thanks ... deech

Probably it's that in the last two, x is given the type [Integer] by ghci (see http://www.haskell.org/haskellwiki/Monomorphism_Restriction ) while view expects an [Int]. Do let x = [1 .. 3] :: [Int] view x and x <- return ([1 .. 3] :: [Int]) view x work?