Macro s_paren

macro_rules! s_paren {
    ($(
        $(#[$attr:meta])*
        pub struct $i:ident ( $($field:tt)* );
    )*) => { ... };
}

Implement Clone and Copy for a tuple struct, as well as Debug, Eq, Hash, and PartialEq if the extra_traits feature is enabled.

This is the same as s but works for tuple structs.