Related to that, it might not actually be the case: https://news.ycombinator.com/item?id=36495667. Key takeaway:
> Rumor 1: Rust takes more than 6 months to learn – Debunked !
> All survey participants are professional software developers (or a related field), employed at Google. While some of them had prior Rust experience (about 13%), most of them are coming from C/C++, Python, Java, Go, or Dart.
> Based on our studies, more than 2/3 of respondents are confident in contributing to a Rust codebase within two months or less when learning Rust. Further, a third of respondents become as productive using Rust as other languages in two months or less. Within four months, that number increased to over 50%. Anecdotally, these ramp-up numbers are in line with the time we’ve seen for developers to adopt other languages, both inside and outside of Google.
> Overall, we’ve seen no data to indicate that there is any productivity penalty for Rust relative to any other language these developers previously used at Google. This is supported by the students who take the Comprehensive Rust class: the questions asked on the second and third day show that experienced software developers can become comfortable with Rust in a very short time.