error: Nullable regular expression

  = note: The regular expression should not match the empty string, but it does

 --> $DIR/fail-03-nullable-regex.rs:5:6
  |
5 |     #[regex("")]
  |      ^^^^^^^^^^^

error: Nullable regular expression

  = note: The regular expression should not match the empty string, but it does

 --> $DIR/fail-03-nullable-regex.rs:8:6
  |
8 |     #[regex(".*")]
  |      ^^^^^^^^^^^^^

error: Nullable regular expression

  = note: The regular expression should not match the empty string, but it does

  --> $DIR/fail-03-nullable-regex.rs:11:6
   |
11 |     #[token("")]
   |      ^^^^^^^^^^^