error: Rule attributes on an #[error] variant

  = note: An #[error] variant must not have #[regex(...)] or #[token(...)] attributes

 --> $DIR/fail-07-mix-err-attr.rs:7:5
  |
7 |     Mixed,
  |     ^^^^^

error: More than one #[error] token
  --> $DIR/fail-07-mix-err-attr.rs:10:5
   |
10 |     Error,
   |     ^^^^^

error: Several #[error] attributes on the same variant

  = note: There should be exactly one #[error] attribute

  --> $DIR/fail-07-mix-err-attr.rs:17:5
   |
17 |     Error,
   |     ^^^^^