Rust 1.58.0 released

Version
1.58.0 of the Rust programming language is available.

Rust 1.58 brings captured identifiers in format strings, a change
to the Command search path on Windows, more
#[must_use] annotations in the standard library, and some
new library stabilizations.

More information on 'captured identifiers' (the ability to use in-scope
variables directly in format strings) can be found on this page.