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Re:Facebook picked Rust to implement Libra by ncmncm on Wednesday June 19, 2019 @01:39PM (#20225343)
Wishful thinking would be my guess.

Rust in production use tends to be found in circumstances where there is no need for mature tooling, and no expectation of a need to hire experienced coders. Of course there are exceptions.

Re:Facebook picked Rust to implement Libra by damnyou on Wednesday June 19, 2019 @02:20PM (#20225741)
It is not that hard for C++ developers to pick up Rust. The borrow checker makes explicit safety requirements that exist in C++.

The tooling does need to be more mature but for many projects the pioneer tax paid to improve the tooling may be worth it. Besides, it's not as if C++ dependency management is very mature either — most people build custom tooling for that anyway.