Macro jsonrpc_macros::build_rpc_trait

macro_rules! build_rpc_trait {
    (
		$(#[$t_attr: meta])*
		pub trait $name: ident {
			$(
				$( #[doc=$m_doc:expr] )*
				#[ rpc( $($t:tt)* ) ]
				fn $m_name: ident ( $($p: tt)* ) -> $result: tt <$out: ty, $error: ty>;
			)*
		}
	) => { ... };
    (
		$(#[$t_attr: meta])*
		pub trait $name: ident {
			type Metadata;

			$(
				$( #[ doc=$m_doc:expr ] )*
				#[ rpc( $($t:tt)* ) ]
				fn $m_name: ident ( $($p: tt)* ) -> $result: tt <$out: ty, $error_std: ty>;
			)*

			$(
				#[ pubsub( $($pubsub_t:tt)+ ) ] {
					$( #[ doc= $sub_doc:expr ] )*
					#[ rpc( $($sub_t:tt)* ) ]
					fn $sub_name: ident ( $($sub_p: tt)* );
					$( #[ doc= $unsub_doc:expr ] )*
					#[ rpc( $($unsub_t:tt)* ) ]
					fn $unsub_name: ident ( $($unsub_p: tt)* ) -> $sub_result: tt <$sub_out: ty, $error_unsub: ty>;
				}
			)*

		}
	) => { ... };
    ( WRAP $del: expr =>
		(name = $name: expr $(, alias = [ $( $alias: expr, )+ ])*)
		fn $method: ident (&self $(, $param: ty)*) -> $result: tt <$out: ty, $error: ty>
	) => { ... };
    ( WRAP $del: expr =>
		(async, name = $name: expr $(, alias = [ $( $alias: expr, )+ ])*)
		fn $method: ident (&self $(, $param: ty)*) -> $result: tt <$out: ty, $error: ty>
	) => { ... };
    ( WRAP $del: expr =>
		(meta, name = $name: expr $(, alias = [ $( $alias: expr, )+ ])*)
		fn $method: ident (&self, Self::Metadata $(, $param: ty)*) -> $result: tt <$out: ty, $error: ty>
	) => { ... };
    ( WRAP $del: expr =>
		pubsub: (name = $name: expr)
		subscribe: (name = $subscribe: expr $(, alias = [ $( $sub_alias: expr, )+ ])*)
		fn $sub_method: ident (&self, Self::Metadata $(, $sub_p: ty)+);
		unsubscribe: (name = $unsubscribe: expr $(, alias = [ $( $unsub_alias: expr, )+ ])*)
		fn $unsub_method: ident (&self $(, $unsub_p: ty)+) -> $result: tt <$out: ty, $error_unsub: ty>;
	) => { ... };
}