That brainfuck interpreter I wrote back in November. I have given it an upgrade. Now it uses StateT and character IO instead of relying on lazy IO. I also made the tape generic in the Integral type used for the cells. I changed the default from using 8-bit cells to using Integer cells and gave made it take a command line option that can specify the exact size of the cells. So for example passing 3 as an argument means that the cells can only hold values in {0,1,2}.
