error: `x @` is not allowed in a tuple struct
  --> $DIR/issue-74539.rs:8:14
   |
LL |         E::A(x @ ..) => {
   |              ^^^^^^ this is only allowed in slice patterns
   |
   = help: remove this and bind each tuple field independently
help: if you don't need to use the contents of x, discard the tuple's remaining fields
   |
LL |         E::A(..) => {
   |              ~~

error: `..` patterns are not allowed here
  --> $DIR/issue-74539.rs:8:18
   |
LL |         E::A(x @ ..) => {
   |                  ^^
   |
   = note: only allowed in tuple, tuple struct, and slice patterns

error[E0023]: this pattern has 1 field, but the corresponding tuple variant has 2 fields
  --> $DIR/issue-74539.rs:8:14
   |
LL |     A(u8, u8),
   |       --  -- tuple variant has 2 fields
...
LL |         E::A(x @ ..) => {
   |              ^^^^^^ expected 2 fields, found 1
   |
help: use `_` to explicitly ignore each field
   |
LL |         E::A(x @ .., _) => {
   |                    +++

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0023`.
