// run-pass use std::ops::Mul; #[derive(Copy, Clone)] pub struct Foo { x: f64, } impl Mul for f64 { type Output = Foo; fn mul(self, rhs: Foo) -> Foo { // intentionally do something that is not * Foo { x: self + rhs.x } } } pub fn main() { let f: Foo = Foo { x: 5.0 }; let val: f64 = 3.0; let f2: Foo = val * f; assert_eq!(f2.x, 8.0); }