Ask HN: Tips for experienced developers learning new languages?

I'm a senior dev who's mostly programmed in C++ and Python, and I'm now looking at learning Rust. It's been about a decade since I learned a new language, and I'm wondering if anyone has tips beyond "read the docs, write lots of code."

Has there been any formal research on new programming language acquisition? Does anyone have a specific "new language" process that works particularly well for them?