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

#![warn(clippy::modulo_one)]
#![expect(clippy::identity_op, clippy::no_effect)]

static STATIC_ONE: usize = 2 - 1;
static STATIC_NEG_ONE: i64 = 1 - 2;

fn main() {
    10 % 1;
    //~^ modulo_one

    10 % -1;
    //~^ modulo_one

    10 % 2;
    // also caught by rustc
    i32::MIN % (-1);
    //~^ modulo_one

    const ONE: u32 = 1 * 1;
    const NEG_ONE: i64 = 1 - 2;
    const INT_MIN: i64 = i64::MIN;

    2 % ONE;
    //~^ modulo_one

    // NOT caught by lint
    5 % STATIC_ONE;
    2 % NEG_ONE;
    //~^ modulo_one

    // NOT caught by lint
    5 % STATIC_NEG_ONE;
    // also caught by rustc
    INT_MIN % NEG_ONE;
    //~^ modulo_one

    // Not caught by lint, we don't look into static items, even if entirely immutable.
    INT_MIN % STATIC_NEG_ONE;
}