error: The tag of 'Three' collides with the tag of 'Two'.
  --> tests/derive-serial/fail-colliding-tag-forward.rs:13:18
   |
13 |     #[concordium(tag = 5)]
   |                  ^^^

error: The tag of 'Two' collides with the tag of 'Three'.
  --> tests/derive-serial/fail-colliding-tag-forward.rs:10:29
   |
10 |     #[concordium(forward = [5, 6])]
   |                             ^