Hello, I've made a small program to parse a file, and write something to stdout based on what was parsed. When the file to parse's format is right, the program works well. If I introduce an error in the file, program as compiled by jhc starts reporting the error then hangs, when compiled with ghc it reports the error correctly. compiled the program with the following command lines, with the same result. : jhc -p parsec DecVersBL.hs jhc -p parsec -funboxed-values DecVersBL.hs jhc -p parsec -flint DecVersBL.hs command line I used to compile with ghc : ghc --make -O2 -funbox-strict-fields DecVersBL.hs results : (first ghc version, then jhc ) david@pcdavid:~/code/edimail$ ghc --version The Glorious Glasgow Haskell Compilation System, version 6.12.3 david@pcdavid:~/code/edimail$ jhc --version jhc 0.7.6 (0.7.6-3) compiled by ghc-6.12 on a i386 running linux david@pcdavid:~/code/edimail$ ./DecVersBL (line 105, column 10): unexpected "!" expecting "=" david@pcdavid:~/code/edimail$ ./hs.out (line 105, column 10): unexpected "!" ^C <---- I type CTRL-C after a long while david@pcdavid:~/code/edimail$ The code and test file are attached. (Many strings and comments are in French, sorry for that) David.