use crate::generic::{Field, Sum, Generic};


struct IntPair {
    a: i32,
    b: i32
}

impl Generic for IntPair {
    type Representation = Sum<Field<i32>, Field<i32>>;
    fn generalize(self) -> Self::Representation {
        Sum { 
            left: Field { value: self.a },
            right: Field { value: self.b }
        }
    }
    fn specialize(rep: Self::Representation) -> Self {
        let Sum {
            left: Field { value: a },
            right: Field { value: b },
        } = rep;
        IntPair { a, b }
    }
}

fn convert(x: IntPair) -> (i32, i32) {
    Generic::specialize(x.generalize())
}