src/tools/clippy/tests/ui/neg_multiply.rs

#![warn(clippy::neg_multiply)]
#![allow(clippy::no_effect, clippy::unnecessary_operation, clippy::precedence)]
#![allow(unused)]

use std::ops::Mul;

struct X;

impl Mul<isize> for X {
    type Output = X;

    fn mul(self, _r: isize) -> Self {
        self
    }
}

impl Mul<X> for isize {
    type Output = X;

    fn mul(self, _r: X) -> X {
        X
    }
}

fn main() {
    let x = 0;

    x * -1;
    //~^ neg_multiply

    -1 * x;
    //~^ neg_multiply

    100 + x * -1;
    //~^ neg_multiply

    (100 + x) * -1;
    //~^ neg_multiply

    -1 * 17;
    //~^ neg_multiply

    0xcafe | 0xff00 * -1;
    //~^ neg_multiply

    3_usize as i32 * -1;
    //~^ neg_multiply
    (3_usize as i32) * -1;
    //~^ neg_multiply

    -1 * -1; // should be ok

    X * -1; // should be ok
    -1 * X; // should also be ok
}

fn float() {
    let x = 0.0;

    x * -1.0;
    //~^ neg_multiply

    -1.0 * x;
    //~^ neg_multiply

    100.0 + x * -1.0;
    //~^ neg_multiply

    (100.0 + x) * -1.0;
    //~^ neg_multiply

    -1.0 * 17.0;
    //~^ neg_multiply

    0.0 + 0.0 * -1.0;
    //~^ neg_multiply

    3.0_f32 as f64 * -1.0;
    //~^ neg_multiply
    (3.0_f32 as f64) * -1.0;
    //~^ neg_multiply

    -1.0 * -1.0; // should be ok
}

struct Y {
    delta: f64,
}

fn nested() {
    let a = Y { delta: 1.0 };
    let b = Y { delta: 1.0 };
    let _ = ((a.delta - 0.5).abs() * -1.0).total_cmp(&1.0);
    //~^ neg_multiply
    let _ = (-(a.delta - 0.5).abs()).total_cmp(&1.0);
}