Rust 1.56.1 adds a mitigation for CVE-2021-42574, the "trojan source" attack that obfuscates code with BiDi control characters. The compiler will now error on such characters in code comments and string/char literals. For more details, see the upstream security advisory.
1.56.1-1.fc331.56.1-1.fc331.56.1-1.fc331.56.1-1.fc331.56.1-1.fc331.56.1-1.fc331.56.1-1.fc331.56.1-1.fc331.56.1-1.fc331.56.1-1.fc33