The author is/was working on MIO, which is a “cross-platform event-handling library for Rust”. And in Rust, all programs are basically always considered to be m

The author is/was working on MIO, which is a “cross-platform event-handling library for Rust”. And in Rust, all programs are basically always considered to be multi–threaded. The borrow checker applies consistent rules whether you spawn any additional threads or not, the built–in test runner is multi–threaded even if your program is not, etc, etc.