rust-clippy/tests/ui/arithmetic.rs

#![feature(plugin)]
#![plugin(clippy)]

#![deny(integer_arithmetic, float_arithmetic)]
#![allow(unused, shadow_reuse, shadow_unrelated, no_effect, unnecessary_operation)]
fn main() {
    let i = 1i32;
    1 + i; //~ERROR integer arithmetic detected
    i * 2; //~ERROR integer arithmetic detected
    1 % //~ERROR integer arithmetic detected
    i / 2; // no error, this is part of the expression in the preceding line
    i - 2 + 2 - i; //~ERROR integer arithmetic detected
    -i; //~ERROR integer arithmetic detected

    i & 1; // no wrapping
    i | 1;
    i ^ 1;
    i >> 1;
    i << 1;

    let f = 1.0f32;

    f * 2.0; //~ERROR floating-point arithmetic detected

    1.0 + f; //~ERROR floating-point arithmetic detected
    f * 2.0; //~ERROR floating-point arithmetic detected
    f / 2.0; //~ERROR floating-point arithmetic detected
    f - 2.0 * 4.2; //~ERROR floating-point arithmetic detected
    -f; //~ERROR floating-point arithmetic detected
}