Macro enumx::impl_super_traits

macro_rules! impl_super_traits {
    ($(_impl!($($gen:tt),*))* DoubleEndedIterator _for!($($ty:tt)+) $(_where!($($pred:tt)*))*) => { ... };
    ($(_impl!($($gen:tt),*))* ExactSizeIterator _for!($($ty:tt)+) $(_where!($($pred:tt)*))*) => { ... };
    ($(_impl!($($gen:tt),*))* Fn<$args:ident> _for!($($ty:tt)+) $(_where!($($pred:tt)*))*) => { ... };
    ($(_impl!($($gen:tt),*))* FnMut<$args:ident> _for!($($ty:tt)+) $(_where!($($pred:tt)*))*) => { ... };
    ($(_impl!($($gen:tt),*))* std::error::Error _for!($($ty:tt)+) $(_where!($($pred:tt)*))*) => { ... };
    ($(_impl!($($gen:tt),*))* std::iter::FusedIterator _for!($($ty:tt)+) $(_where!($($pred:tt)*))*) => { ... };
    ($(_impl!($($gen:tt),*))* std::iter::TrustedLen _for!($($ty:tt)+) $(_where!($($pred:tt)*))*) => { ... };
    ($(_impl!($($gen:tt),*))* std::io::BufRead _for!($($ty:tt)+) $(_where!($($pred:tt)*))*) => { ... };
    ($(_impl!($($gen:tt),*))* std::ops::DerefMut _for!($($ty:tt)+) $(_where!($($pred:tt)*))*) => { ... };
    ($(_impl!($($gen:tt),*))* std::ops::IndexMut _for!($($ty:tt)+) $(_where!($($pred:tt)*))*) => { ... };
    ($($_tt:tt)+) => { ... };
}

The impl_super_traits!{} macro helps to implement the super trait(s) of the mentioned trait, e.g. impl_super_traits!{ _impl!(Args) Fn<Args> _for!( Type )} will implement FnMut and FnOnce for Type, but NOT Fn.