When adding a code block to a comment in Stash, it will always parse the '@' symbol and look for user names. I would expect code blocks to be literal, or there should be a way to escape the '@' symbol. This is especially sad when you are trying to markup Makefiles and someone on your system has the user name "echo". Your Makefile code block looks like:

Some User CC file.c

when you really want it to look like:

@echo CC file.c