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There are a million things. Fast compile times, UTF8 strings by default, easy concurrency, great standard libraries.

And the most important thing - I can easily read and understand the code written by others.

> Why would a C++ programmer learn Go?

Perhaps to find a new reason to hate a programming language thanks to Go's GOPATH.

rust is just new, not too bloated, YET. long way to go until it can be seen as a "better C++".

Agreed, it is lacking tooling support and many other things, but it is a cleaner C++. That plus the borrow checker are its two major features. Otherwise, nobody would use it and their designers would have done a pretty bad job given the 30 years of experience they had from C++!