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/// An interface for numbers.
trait Num {
// FIXME: Trait composition. (#2616)
pure fn add(&&other: self) -> self;
pure fn sub(&&other: self) -> self;
pure fn mul(&&other: self) -> self;
pure fn div(&&other: self) -> self;
pure fn modulo(&&other: self) -> self;
pure fn neg() -> self;
pure fn to_int() -> int;
static pure fn from_int(n: int) -> self;
}
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