pub trait Tuple4<A, B, C, D> {
fn n0(self) -> A;
fn n1(self) -> B;
fn n2(self) -> C;
fn n3(self) -> D;
}
fn n0(self) -> Afn n1(self) -> Bfn n2(self) -> Cfn n3(self) -> Dimpl<A, B, C, D> Tuple4<A, B, C, D> for (A, B, C, D)
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Accepted types are: fn, mod,
struct (or str), enum,
trait, typedef (or
tdef).