Macro syn_lite::parse_generics

macro_rules! parse_generics {
    (
        $([ $($before:tt)* ])?
        {
            <>
            $($rest:tt)*
        }
        $([ $($after:tt)* ])?
        => $($out_macro_and_bang:tt)+
    ) => { ... };
    (
        $([ $($before:tt)* ])?
        {
            <$(
                $($lt:lifetime)?
                $($tp1:ident $($tp2:ident)?)?
                $(
                    :
                    $($bound_lt:lifetime)?
                    $(+ $bounds_lt:lifetime)*
                    $(
                        $( + $({$plus_ignore:tt })? )?
                        $( ? $([$relax_ignore:tt])? )?
                        $bounds:path
                    )*
                )?
                $(
                    =
                    $($default_lit:literal)?
                    $({ $($default_const_block:tt)* })?
                    $($default_ty:ty)?
                )?
            ),+ >
            $($rest:tt)*
        }
        $([ $($after:tt)* ])?
        => $($out_macro_and_bang:tt)+
    ) => { ... };
    (
        $([ $($before:tt)* ])?
        { $($rest:tt)* }
        $([ $($after:tt)* ])?
        => $($out_macro_and_bang:tt)+
    ) => { ... };
}

Generics inside <...> but without < > and without where clause.