Hi, The following code should print string anyway. https://gist.github.com/kazu-yamamoto/6265119/raw/1da32b8740222076e612373a71... But if I execute it with "runghc" on 32 bit Mac and 32 bit Linux, it terminates silently. If complied, it works. If I execute it with "runghc" on 64 bit Linux, it works. Does anyone reproduce this? I'm using GHC 7.7.20130814. --Kazu