Rust overlaps with C/C++ and even with Go. Go was initially trying to be a replacement for C/C++, but hasn't succeeded, because it is too high level. Rust on the other hand looks very promising in that area, which requires low level access but also desires safety.
I wouldn't say Go hasn't succeeded. Maybe not as a general replacement for C/C++. But still lots of new applications that would most likely have been written in C/C++ a few years ago are now popping up in Go (unix daemons, commandline tools, ...).
Go has succeeded in its niche (distributed systems). There are real jobs opportunities in Go, in the major tech hubs.
Funny thing is. Everything that is done in Go could be done in Java. Go is succeeding because lots of dev despise Java (related to the entreprisey & the usual culture of java companies).
As well as the fact that Go runs markedly faster and lighter (memory) than Java, and without needing to worry about JVM versions. We've been slowly migrating services and the statically compiled binaries are truly amazing for ensuring it will run. Not once have I encountered an 'it runs on my machine' situation.
