code { CHECK_SIGNATURE } ;
input { Stack_elt unit Unit ;
        Stack_elt signature "spsig1CzQigtXJRFdtX2p6xBQZ3KVmx6gx8gozcytf8einfzwXrpfuU8YwvhYMYTSpZGVo7KzVstPzvGZWMVXa1TW68zpJEzyPw" ;
        Stack_elt bytes 0x12 } ;
output (StaticError _) ;