pub trait SetIntro<Elm>: Debug + Hash + PartialEq + Eq + Clone + 'static {
fn empty() -> Self;
fn add(_: Self, e: Elm) -> Self;
fn remove(_: Self, e: &Elm) -> Self;
fn union(_: Self, _: Self) -> Self;
fn inter(_: Self, _: Self) -> Self;
fn diff(_: Self, _: Self) -> Self;
}
fn empty() -> Self
fn add(_: Self, e: Elm) -> Self
fn remove(_: Self, e: &Elm) -> Self
fn union(_: Self, _: Self) -> Self
fn inter(_: Self, _: Self) -> Self
fn diff(_: Self, _: Self) -> Self
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