Macro impl_register_interceptor 

macro_rules! impl_register_interceptor {
    (
		$closure_type:ident<T, F>,
		$context_type:ident<T>,
		$trait_type:ident,
		$field:ident
	) => { ... };
    (
		$closure_type:ident<F>,
		$context_type:ident,
		$trait_type:ident<T>,
		$field:ident
	) => { ... };
}