Just finished writing what seems to be the hardest part of a compiler, for the nand2tetris book.
Well, that was one of the toughest pieces of software I wrote (and re-wrote until I got it right) so far. And I am proud of myself for doing it in about one week or so.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko