The item 6 of my answer about lex/yacc is not correct.
But (like here) it insists in one.
Also, the items 6.1, 6.2 and 6.3 do not work. I didn't want to blockquote. My first attempt was to use code sample. It did not work. Then I moved on to sub-itens. Not ok. My third option was blockquote, but I'm unhappy with it. At least it looks like code.