"ok"
"error: \"./Catch.hs\",21:20: bang!"
"Non-exhaustive patterns \"./Catch.hs\",6:1"
"No instance nor default method for class operation m, at \"./Catch.hs\",9:3"
"hello"
"bye"
"hello"
"bye"
"Handle(Catch.in): end of file (hGetChar)"