Macro nom::branch::permutation_trait_inner

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macro_rules! permutation_trait_inner {
    ($it:tt, $self:expr, $input:ident, $res:expr, $err:expr, $head:ident $($id:ident)*) => { ... };
    ($it:tt, $self:expr, $input:ident, $res:expr, $err:expr,) => { ... };
}