struct Length(u8); struct Meter; impl core::ops::Mul<Meter> for u8 { type Output = Length; fn mul(self, _: Meter) -> Length { Length(self) } } #[derive(Clone, Default, PartialEq, Eq, Hash)] struct Vec1 { x: i32, } impl core::ops::Mul<Vec1> for i32 { type Output = Vec1; fn mul(self, mut right: Vec1) -> Vec1 { right.x *= self; right } } impl core::ops::Mul<i32> for Vec1 { type Output = Vec1; fn mul(mut self, right: i32) -> Vec1 { self.x *= right; self } } #[allow(clippy::no_effect)] #[warn(clippy::erasing_op)] fn test(x: u8) { x * 0; 0 & x; 0 / x; 0 * Meter; // no error: Output type is different from the non-zero argument 0 * Vec1 { x: 5 }; Vec1 { x: 5 } * 0; } fn main() { test(0) }