error: identifiers must be strings or integers
  --> $DIR/invalid_path_syntax.rs:10:34
   |
10 |     let _ = keypath!(TuplePerson.2. 0);
   |                                  ^^

error: expected field identifier, found '.'
  --> $DIR/invalid_path_syntax.rs:11:35
   |
11 |     let _ = keypath!(TuplePerson.2..0);
   |                                   ^^