Found another bug that surfaces when we compile c2hs with ghc-6.12. By default text files are now read in the locale encoding rather than just ASCII. This means we can (and do) get characters over 255. The behaviour is that c2hs goes into an infinite loop and consumes all the memory on your machine (in particular this happens with some files in gtk2hs). Unfortunately the 255 assumption is pretty strongly wired into the c2hs lexer. From Lexer.hs: -- * Unicode posses a problem as the character domain becomes too big -- for using arrays to represent transition tables and even sparse -- structures will posse a significant overhead when character ranges -- are naively represented. So, it might be time for finite maps again. The short term solution is to set the text mode to be ASCII. In the longer term we might want to replace the .chs lexer and parser, like we did already for the C parser. Duncan