Your first line is entirely natural. The alternative doesn't look right at all. I am not aware of a more concise alternative to this general construction (assuming there are multiple case alternative, and that the work can't be done with library functions). Chris From: haskell-cafe-bounces@haskell.org [mailto:haskell-cafe-bounces@haskell.org] On Behalf Of tsuraan Sent: 14 March 2011 15:49 To: haskell-cafe@haskell.org Subject: [Haskell-cafe] Question on a common pattern In my code, I'm doing this quite a lot: x <- someIO case x of Opt1 -> ... Having a line for extracting the value from the IO (or STM) and then acting on the value seems unnatural. Is there a more concise way to do this? This code: case someIO of Opt1 -> ... Doesn't work, but is there something like that, that is valid? _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe _____ No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1204 / Virus Database: 1498/3506 - Release Date: 03/14/11