@tarek
I'd say you compare the time needed to perform equivalent tasks.
From personal experience, this checks out. I'm x2~x3 more productive in Rust than in C++
@MishaalRahman Android's experience with Rust has been excellent. My team built the first major Rust component (keystore), which is a medium-sized component with significant concurrency. We're now three years in and it has been basically flawless.
@arendjr
I don't have representative numbers like Google, but if they're saying 2x I'd say they're only talking about the immediate productivity gains of the initial implementation (+maybe initial review)
Anecdata, but my personal estimate is around x2~x3 initial velocity, converging to an order of magnitude if I factor maintenance. Rust is really good for refactoring code