Forbid Not operator (`!`)

What it does

Forbid the usage of not operator (!) in if $expr, while $expr and assert!($expr).
Use .not() instead. (std::ops::Not)

Lint Name

not_operator_used

Category

style
restriction

Advantage

.not() is more conspicuous than ! and looks continuous.

Drawbacks

No response

Example

assert!(!expr);

if !expr {
   // ...
}

while !expr {
   // ...
}

Could be written as:

use std::ops::Not;

assert!(expr.not());

if expr.not() {
   // ...
}

while expr.not() {
   // ...
}

No file or test path is named in the issue. Start by locating the existing Rust Clippy lint entry points and tests, then use the three examples as acceptance cases for not_operator_used: the targeted ! forms should be diagnosed, while the .not() forms should remain valid.