Security advisory for rustc (CVE-2021-42574)

This is a cross-post of the official security advisory. The official advisory contains a signed version with our PGP key, as well. The Rust Security Response WG was notified of a security concern affecting source code containing "bidirectional override" Unicode codepoints: in some cases the use of those codepoints could lead to the reviewed code being different than the compiled code. This is a vulnerability in the Unicode specification, and its assigned identifier is CVE-2021-42574. While the...