pub trait Signed: Num + Neg<Self> {
fn abs(&self) -> Self;
fn abs_sub(&self, other: &Self) -> Self;
fn signum(&self) -> Self;
fn is_positive(&self) -> bool;
fn is_negative(&self) -> bool;
}
fn abs(&self) -> Selffn abs_sub(&self, other: &Self) -> Selffn signum(&self) -> Selffn is_positive(&self) -> boolfn is_negative(&self) -> bool
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