[Haskell-cafe] IO in lists

Joachim Breitner mail at joachim-breitner.de
Tue Jan 16 11:30:58 EST 2007

Hi again,

if sequence' should work with empty lists, then better write it like

sequence' ms = foldr k (return []) ms
	      k m m' = do { x <- m; xs <- unsafeInterleaveIO m'; return (x:xs) }

Joachim "nomeata" Breitner
  mail: mail at joachim-breitner.de | ICQ# 74513189 | GPG-Key: 4743206C
  JID: joachimbreitner at amessage.de | http://www.joachim-breitner.de/
  Debian Developer: nomeata at debian.org

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