error: #[packet]'s must contain a payload
  --> tests/compile-fail/no_payload.rs:13:1
   |
13 | #[packet] //~ ERROR: #[packet]'s must contain a payload
   | ^^^^^^^^^
   |
   = note: this error originates in the derive macro `::pnet_macros::Packet` (in Nightly builds, run with -Z macro-backtrace for more info)