error: Missing initial state. To declare an initial state you can use a function with signature like `fn f() -> T` where `T` is a declared state.
 --> $DIR/missing_initial_final_states.rs:3:1
  |
3 | #[typestate]
  | ^^^^^^^^^^^^
  |
  = note: this error originates in the attribute macro `typestate` (in Nightly builds, run with -Z macro-backtrace for more info)

error: Missing final state. To declare a final state you can use a function with signature like `fn f(self) -> T` where `T` is not a declared state.
 --> $DIR/missing_initial_final_states.rs:3:1
  |
3 | #[typestate]
  | ^^^^^^^^^^^^
  |
  = note: this error originates in the attribute macro `typestate` (in Nightly builds, run with -Z macro-backtrace for more info)