C and Go both classified as high level system language, but I can't deny the fact that C allows for finer control over machine usage so it's hard to put Go in the same bag.
Therefore I'd bundle it with C and D rather than Erlang.
I've been writing Go full-time for over 2 years and used to write mostly Java/C#, so I should know. When I started with Go and ported many of my personal Java applications, they all were much more maintainable and straight forward in Go.
Of course C had always been favorite language, and all I ever really wanted was a "modern" C, so I am probably biased.