Function append 

pub fn append<Init, Last>(init: Init, last: Last) -> Append<Init, Last>
where
    (Init, Last): TupleAppend<Init, Last>,

Available on crate feature append only.

Append an element to a tuple.

use tupleops::append;

assert_eq!(
    append((1, 2, 3), 4),
    (1, 2, 3, 4),
);

See also: Append, TupleAppend.