fn mul(self,rhs: Person)->Self::Output
^^^consuming self, why?
Surely if I want to multiply "a * b" I don't want neither a nor b to be consumed...
Can I have non consuming mul operator?
impl<'a> Mul for &'a Type creates a non-consuming implementation if you need it.
Normally Mul is implemented for Copy types though, so consuming the arguments doesn't actually do anything.
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