Rust is a systems programming language that runs blazingly fast, prevents segfaults, and guarantees thread safety.
I am uncomfortable with “guarantees thread safety”. Rust does no such thing, since unsafe Rust is part of Rust. (It is Rust code that compiles and runs on stable Rust, etc.)
I am much more comfortable with “prevents segfaults”, because it does, and it is not worded “prevents all segfaults” (which is false) or “guarantees memory safety” (similarly). In general, I think all claims on Rust should consider the existence of unsafe Rust carefully.