-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 main = do print "hello" print (True) print "bye" compiling with my darcs-nhc98 on my computer and running, I get: "hello" Segmentation fault (core dumped) Before trying that, I noticed that Integers had some problems... module Main(main) where main = do print "hello" if 2 > (1::Int) then print "SmartInt" else print "StupidInt" if 2 > (1::Integer) then print "SmartIntegerA" else print "StupidIntegerA" if 1 < (2::Integer) then print "SmartIntegerB" else print "StupidIntegerB" print (1::Int) print (1::Integer) print "bye" My results, plus comments verified by other experiments: "hello" "SmartInt" --Ints are fine "StupidIntegerA" --Integers are "SmartIntegerB" --not working right 1 --Ints are still fine Segmentation fault (core dumped) --Instance Show Integer crashes the program show (1::Integer) `seq` print "integ" --prints "integ" (shallow seq) foldr seq () (show (1::Integer)) `seq` print "integ" --crashes (deep seq) I suppose maybe I compiled nhc wrong, since I manually modified an "==" to "=" in one file, and restarted its compilation several times, though I can't see how those could cause these problems... Isaac -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFF6Jk6HgcxvIWYTTURApy5AJ971v1rRcy6fqnBrTheaQarakIPNgCfXZmg sRq1AhmrIxPIW9bY58bbbUw= =FLqA -----END PGP SIGNATURE-----