Rustaceans at the border

Rustaceans at the border

non-edition style changes

I think calling them style changes is a bit misleading. Generally, the stuff that bumps the minimum supported Rust version is the addition or stabilization of new standard library types/functions that people are then quick to jump on because they significantly reduce some boilerplate that has become near enough to ubiquitous to justify their creation.

(If you want to see the kind of things I'm talking about, caniuse.rs provides a quick overview.)

For example, one of the things introduced in Rust 1.56 was adding the rust field to Cargo.toml so libraries can specify the minimum supported Rust version in a machine-readable way.