Macro ops::def_monoid_generics

source ยท 
macro_rules! def_monoid_generics {
    (
        $(#[$attr:meta])*
        $name:ident[$($gen:tt)*] where [$($where:tt)*] =
            ($ty:ty, $op:expr, $id:expr $(, $marker:ident)? $(,)?) $(,)?
    ) => { ... };
    (
        $(#[$attr:meta])*
        pub $name:ident[$($gen:tt)*] where [$($where:tt)*] =
            ($ty:ty, $op:expr, $id:expr $(, $marker:ident)? $(,)?) $(,)?
    ) => { ... };
    (
        $(#[$attr:meta])*
        pub($($vis:tt)+) $name:ident[$($gen:tt)*] where [$($where:tt)*] =
            ($ty:ty, $op:expr, $id:expr $(, $marker:ident)? $(,)?) $(,)?
    ) => { ... };
}