“Until last year” is technically correct but not really accurate. Lifetimes were made non-lexical in 2018, but only for Rust 2018 code and newer. Last year is w

“Until last year” is technically correct but not really accurate. Lifetimes were made non-lexical in 2018, but only for Rust 2018 code and newer. Last year is when they were made non-lexical for 2015 code as well. For the vast majority of Rust developers, lifetimes have been non-lexical for five years now.