I've just wrote
C:\ in a comment and it wouldn't work. I had to write
C:\ (with a trailing space).
Am I too drunk, or is it a real bug?
Here on the question it seems to be working.
Yeah, comment markdown and escaping is... weird. I've been shying aways from changing this, since it's been like this forever, so it may break a ton of old comments. On the plus side, backslash escaping of backticks in code spans only happens in one-backtick spans*. But since these days, comment Markdown supports Markdown's multi-backtick codespans, you can use that for achieving what you want:
*That is a weird sentence.