You really have pretty much spec'ed Go, except that when you want something manual you either use some []byte hacks or use the unsafe package to speak to some C code. Even when you want manual memory management it's rare that you need the entire program manually managed; usually there's some sort of hot data structure or code or something that you'd like to take over but that doesn't mean you want to fiddle with every last little character string manually.

In particular, in the modern era, you're not going to find very many other languages that have anonymous functions but almost no functional programming capability like Go has. If you want to keep FP sealed away from your program... you know, for whatever reason, but to each their own... Go's got you about as well covered as you could hope for. Almost anything else that might come out is probably going to have FP constructs in it. (Especially after watching Go get raked over the coals for not having them.)