Macro buffer_xof 

macro_rules! buffer_xof {
    (
        $(#[$hasher_attr:meta])*
        $hasher_vis:vis struct $hasher_name:ident($hasher_core:ty);
        $(oid: $oid:literal;)?
        impl: $($hasher_trait_name:ident)*;

        $(#[$reader_attr:meta])*
        $reader_vis:vis struct $reader_name:ident($reader_core:ty);
        impl: $($reader_trait_name:ident)*;
    ) => { ... };
    (
        impl_inner: $name:ident($core_ty:ty); ;
    ) => { ... };
    (
        impl_inner: $name:ident($core_ty:ty);
        XofHasherTraits $($trait_name:ident)*;
    ) => { ... };
    (
        impl_inner: $name:ident($core_ty:ty);
        XofReaderTraits $($trait_name:ident)*;
    ) => { ... };
    (
        impl_inner: $name:ident($core_ty:ty);
        Debug $($trait_name:ident)*;
    ) => { ... };
    (
        impl_inner: $name:ident($core_ty:ty);
        AlgorithmName $($trait_name:ident)*;
    ) => { ... };
    (
        impl_inner: $name:ident($core_ty:ty);
        Default $($trait_name:ident)*;
    ) => { ... };
    (
        impl_inner: $name:ident($core_ty:ty);
        CustomizedInit $($trait_name:ident)*;
    ) => { ... };
    (
        impl_inner: $name:ident($core_ty:ty);
        Clone $($trait_name:ident)*;
    ) => { ... };
    (
        impl_inner: $name:ident($core_ty:ty);
        BlockSizeUser $($trait_name:ident)*;
    ) => { ... };
    (
        impl_inner: $name:ident($core_ty:ty);
        CoreProxy $($trait_name:ident)*;
    ) => { ... };
    (
        impl_inner: $name:ident($core_ty:ty);
        HashMarker $($trait_name:ident)*;
    ) => { ... };
    (
        impl_inner: $name:ident($core_ty:ty);
        Update $($trait_name:ident)*;
    ) => { ... };
    (
        impl_inner: $name:ident($core_ty:ty);
        Reset $($trait_name:ident)*;
    ) => { ... };
    (
        impl_inner: $name:ident($core_ty:ty);
        ExtendableOutputReset $($trait_name:ident)*;
    ) => { ... };
    (
        impl_inner: $name:ident($core_ty:ty);
        SerializableState $($trait_name:ident)*;
    ) => { ... };
}

Creates a buffered wrapper around block-level “core” type which implements extendable output size traits.