Function tuple8

pub const fn tuple8<A, B, C, D, E, F, G, H>(
    a: A,
    b: B,
    c: C,
    d: D,
    e: E,
    f: F,
    g: G,
    h: H,
) -> (A, B, C, D, E, F, G, H)

Create a tuple of 8 elements.