Static rustc_lint_defs::builtin::TEXT_DIRECTION_CODEPOINT_IN_COMMENT

pub static TEXT_DIRECTION_CODEPOINT_IN_COMMENT: &Lint

The text_direction_codepoint_in_comment lint detects Unicode codepoints in comments that change the visual representation of text on screen in a way that does not correspond to their on memory representation.

Example

#![deny(text_direction_codepoint_in_comment)]
fn main() {
    println!("{:?}"); // '‮');
}

{{produces}}

Explanation

Unicode allows changing the visual flow of text on screen in order to support scripts that are written right-to-left, but a specially crafted comment can make code that will be compiled appear to be part of a comment, depending on the software used to read the code. To avoid potential problems or confusion, such as in CVE-2021-42574, by default we deny their use.