A derived mode implementing most of the C# rules. After a good number of years, we noticed that there wasn't a "non-patched" version of a csharp-mode for Emacs. There were a few, but most of them had comments that they were "in progress" or "about to merge", but then we noticed that those notices were there even after a couple of months. Then, we saw a request for a csharp-mode on the cc-mode Emac