restrict: str_literal.chars().any(|x| x == c) affects performance negatively

[KisaragiEffective]

What it does

prevents str_literal.chars().any(|x| x == c).

Lint Name

str_literal_chars_any

Category

restriction

Advantage

• Contributes optimizer: see https://godbolt.org/z/nsdPj3EaP, about x40 speed

Drawbacks

No response

Example

let foo: bool = "\\.+*?()|[]{}^$#&-~".chars().any(|x| x == c)

Could be written as:

let foo: bool = match c {
    '\\' | '.' | '+' | '*' | '?' | '(' | ')' | '|' | '[' | ']' | '{'
    | '}' | '^' | '$' | '#' | '&' | '-' | '~' => true,
    _ => false,
}