error: No starting state defined, indicate the starting state with a *.
  --> $DIR/no_starting_state.rs:5:1
   |
5  | / statemachine! {
6  | |     transitions: {
7  | |         //~ ERROR No starting state defined, indicate the starting state with a *
8  | |         State1 + Event1 = State2,
9  | |         State2 + Event2 = State3,
10 | |     }
11 | | }
   | |_^
   |
   = note: this error originates in the macro `statemachine` (in Nightly builds, run with -Z macro-backtrace for more info)