Macro pallet_contracts::gen_signature_dispatch

macro_rules! gen_signature_dispatch {
    (
		$needle_name:ident,
		$needle_sig:ident ;
		$name:ident
		( $ctx:ident $( , $names:ident : $params:ty )* ) $( -> $returns:ty )* , $($rest:tt)* ) => { ... };
    ( $needle_name:ident, $needle_sig:ident ; ) => { ... };
}