pub trait TupleMapperSecond<Input, Output, Result>where
Self: Sized,{
// Required method
fn map_second(self, mapper: impl FnOnce(Input) -> Output) -> Result;
}
pub trait TupleMapperSecond<Input, Output, Result>where
Self: Sized,{
// Required method
fn map_second(self, mapper: impl FnOnce(Input) -> Output) -> Result;
}