Re: [Haskell-cafe] Question on case x of g when g is a function
Because both bit0 and bit1 are free *local* variables within the case expression. So, they have nothing to do with your defined functions bit0 and bit1. Best regards, Salvador. [EMAIL PROTECTED] wrote: Can a kind soul please enlighten me on why f bit0 and f bit1 both return 0? bit0 = False bit1 = True f x = case x of bit0 - 0 bit1 - 1 ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] conflicting variable definitions in pattern
Dear Martin, I think that the (practical) reason is avoiding equality checks during pattern matching. For instance, how do you evaluate this: foo ((+1):(1+):[])? Both expressions in the first and second entries of the list are semantically equivalent, but from an operational point of view, you have to ensure the equality of two functions over an infinite domain (of integer numbers). Best regards, Salvador. Martin Hofmann escribió: It is pretty clear, that the following is not a valid Haskell pattern: foo (x:x:xs) = x:xs My questions is _why_ this is not allowed. IMHO, the semantics should be clear: The pattern is expected to succeed, iff 'x' is each time bound to the same term. Isn't this allowed, because this would require a strict evaluation of the 'x' variables? Thanks, Martin ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] haskell platform - mac lion - installation error
Dear Peter, I recently had a similar problem with the same Haskell Platform version but on a Macmini (running Lion as well). I learnt that you have to install the 'command line tools' by using the 'preferences' of your XCode installation. After that, everything will work. Best regards, Salvador. El 10/03/12 10:15, Peter escribió: Hello - I'm a new user, having some trouble installing the Haskell Platform (2011.4.0.0 64bit.pkg) on a Macbook Pro (10.7.3). I installed Xcode 4.3.1 (4E1019), then the Haskell Platform. When I double-click on the Platform package icon, I get an installation dialogue with an error message reading Developer Tools Missing - Please install Xcode developer tools first. Are Xcode developer tools something distinct from Xcode itself? I'm mystified by this error message. Any assistance would be greatly appreciated - thank you. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Any Haskell events in Madrid next week?
Hi, There is a workshop on Functional Programming and also a conference on programming languages http://babel.ls.fi.upm.es/tpf2013/cfp_english.txt If interested, you can contact the organizers... Regards, Salvador. El 06/09/13 22:59, Joachim Breitner escribió: Hi, I'll be visiting Madrid next week (research visit) and I'm wondering if there are any Haskell or FP Group meeting or other events that might be interesting? I could possibly contribute a talk. (Both preferably in English.) Wednesday or Thursday evening might would most convenient. Greetings, Joachim ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
