<p>RustBelt is built on top of <em>Iris</em>, a language-agnostic framework, implemented in the Coq proof assistant, for building higher-order concurrent separation logics. This dissertation begins by giving an introduction to Iris, and explaining how Iris enables the derivation of complex high-level reasoning principles from a few simple ingredients. In RustBelt, this technique is exploited crucially to introduce the <em>lifetime logic</em>, which provides a novel separation-logic account of <em>borrowing</em>, a key distinguishing feature of the Rust type system.</p>
<p>RustBelt is built on top of <em>Iris</em>, a language-agnostic framework, implemented in the Coq proof assistant, for building higher-order concurrent separation logics. This dissertation begins by giving an introduction to Iris, and explaining how Iris enables the derivation of complex high-level reasoning principles from a few simple ingredients. In RustBelt, this technique is exploited crucially to introduce the <em>lifetime logic</em>, which provides a novel separation-logic account of <em>borrowing</em>, a key distinguishing feature of the Rust type system.</p>