pub struct Something { pub x: isize } pub trait A { fn f(&self) -> isize; fn g(&self) -> isize { 10 } fn h(&self) -> isize { 11 } fn lurr(x: &Self, y: &Self) -> isize { x.g() + y.h() } } impl A for isize { fn f(&self) -> isize { 10 } } impl A for Something { fn f(&self) -> isize { 10 } } pub trait B<T> { fn thing<U>(&self, x: T, y: U) -> (T, U) { (x, y) } fn staticthing<U>(_z: &Self, x: T, y: U) -> (T, U) { (x, y) } } impl<T> B<T> for isize { } impl B<f64> for bool { } pub trait TestEquality { fn test_eq(&self, rhs: &Self) -> bool; fn test_neq(&self, rhs: &Self) -> bool { !self.test_eq(rhs) } } impl TestEquality for isize { fn test_eq(&self, rhs: &isize) -> bool { *self == *rhs } }