Re: [Haskell-cafe] How to implement nested loops with tail recursion?

Hi! On 19/09/12 19:00, sdiyazg@sjtu.edu.cn wrote:

So how do I force IO actions whose results are discarded (including IO ()) to be strict?

() <- foo :: IO () -- should work as it pattern matches, can wrap it in a prettier combinator !_ <- foo :: IO a -- could work with -XBangPatterns I've not tested either (been away from Haskell for a while..), but see also: http://markmail.org/message/i7eufihlhgq4jqt6 (regarding modifyIORef and leaky issues) Claude -- http://mathr.co.uk