There are arguments for and against but for colour: D in GCC uses a shared frontend, which means it's not hard to maintain the frontend aspects — but that also

There are arguments for and against but for colour: D in GCC uses a shared frontend, which means it's not hard to maintain the frontend aspects — but that also means the frontend is a monoculture which is not very healthy at the moment. If someone will pay you to do it I would do a new frontend — it's surprisingly little work to get something you can bootstrap with.