I haven't got any experience with Go development, but from those I know that use it, I hear nothing but promising things about Nim. "Modern" is a word that gets used.
Between Rust and Nim, we're starting to see some really clever new languages that fix common pain points. Both of these are so neat it makes me feel as though we're in a programming language boom right now.
It gives you a high quality set of components that cover a big bunch of the things you need when implementing a compiler. Energy can be spent in the language itself.
Oh, and I guess the constructor syntax, which again I wish Python would adopt. I end up with too many "self.x = x" lines in my Python __init__ methods; pure syntactic ceremony.