error[E0415]: identifier `a` is bound more than once in this parameter list
  --> $DIR/pat-at-same-name-both.rs:6:14
   |
LL |     fn f(a @ a @ a: ()) {}
   |              ^ used as parameter more than once

error[E0415]: identifier `a` is bound more than once in this parameter list
  --> $DIR/pat-at-same-name-both.rs:6:18
   |
LL |     fn f(a @ a @ a: ()) {}
   |                  ^ used as parameter more than once

error[E0416]: identifier `a` is bound more than once in the same pattern
  --> $DIR/pat-at-same-name-both.rs:11:20
   |
LL |         Ok(a @ b @ a)
   |                    ^ used in a pattern more than once

error[E0416]: identifier `a` is bound more than once in the same pattern
  --> $DIR/pat-at-same-name-both.rs:13:23
   |
LL |         | Err(a @ b @ a)
   |                       ^ used in a pattern more than once

error[E0416]: identifier `a` is bound more than once in the same pattern
  --> $DIR/pat-at-same-name-both.rs:18:13
   |
LL |     let a @ a @ a = ();
   |             ^ used in a pattern more than once

error[E0416]: identifier `a` is bound more than once in the same pattern
  --> $DIR/pat-at-same-name-both.rs:18:17
   |
LL |     let a @ a @ a = ();
   |                 ^ used in a pattern more than once

error[E0416]: identifier `a` is bound more than once in the same pattern
  --> $DIR/pat-at-same-name-both.rs:21:21
   |
LL |     let ref a @ ref a = ();
   |                     ^ used in a pattern more than once

error[E0416]: identifier `a` is bound more than once in the same pattern
  --> $DIR/pat-at-same-name-both.rs:23:29
   |
LL |     let ref mut a @ ref mut a = ();
   |                             ^ used in a pattern more than once

error[E0416]: identifier `a` is bound more than once in the same pattern
  --> $DIR/pat-at-same-name-both.rs:26:17
   |
LL |     let a @ (Ok(a) | Err(a)) = Ok(());
   |                 ^ used in a pattern more than once

error[E0416]: identifier `a` is bound more than once in the same pattern
  --> $DIR/pat-at-same-name-both.rs:26:26
   |
LL |     let a @ (Ok(a) | Err(a)) = Ok(());
   |                          ^ used in a pattern more than once

error: cannot borrow value as mutable more than once at a time
  --> $DIR/pat-at-same-name-both.rs:23:9
   |
LL |     let ref mut a @ ref mut a = ();
   |         ^^^^^^^^^   --------- value is mutably borrowed by `a` here
   |         |
   |         value is mutably borrowed by `a` here

error[E0384]: cannot assign twice to immutable variable `a`
  --> $DIR/pat-at-same-name-both.rs:13:15
   |
LL |         Ok(a @ b @ a)
   |                    - first assignment to `a`
LL |
LL |         | Err(a @ b @ a)
   |               ^ cannot assign twice to immutable variable
   |
help: consider making this binding mutable
   |
LL |         Ok(a @ b @ mut a)
   |                    +++
help: to modify the original value, take a borrow instead
   |
LL |         Ok(a @ b @ ref mut a)
   |                    +++++++

error: aborting due to 12 previous errors

Some errors have detailed explanations: E0384, E0415, E0416.
For more information about an error, try `rustc --explain E0384`.