Warn about yen signs (¥) or won signs (₩) followed by an escape character

[KamilaBorowska]

What it does

Warns about U+00A5 or U+20A9 followed by an escape character (x, n, r, t, u, 0) or itself.

Categories (optional)

• Kind: suspicious

Doing so suggests the intent to actually use U+005C (\) instead. When using Windows in Japanese locale, U+005C is rendered as a Yen sign. When using Windows in Korean locale, U+005C is rendered as a won sign.

Drawbacks

None.

Example

print!("Hello¥n");

Could be written as:

print!("Hello\u{A5}n");

or what was probably intended:

print!("Hello\n");

[KamilaBorowska]

Examples of violations:

• https://github.com/Yamato-Security/hayabusa/blob/b97b22403eb4ef4633b7e5a32b499051ae7e395e/src/detections/rule/count.rs#L850
• https://github.com/ktanaka101/monkey.rs/blob/bc000a6db7fbf49d26b9ba6390a8aa2f66e9f0a6/src/compiler.rs#L1612