Generally when talking about colored functions, I think of an example like "async function" in javascript, those are definitely different colored.
I don't know about what would constitute as colored function in go as I generally don't consider arguments to be function colors.
Maybe methods in go would be different colored functions when they are defined on different struct types.
I don't think there's a way to color functions in Go. That's not terribly special, several languages have no colors in them.