error: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:8:9
   |
LL |         ref mut z @ &mut Some(ref a) => {
   |         ---------^^^^^^^^^^^^^-----^
   |         |                     |
   |         |                     value is borrowed by `a` here
   |         value is mutably borrowed by `z` here

error: cannot borrow value as mutable more than once at a time
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:33:9
   |
LL |     let ref mut a @ (ref b @ ref mut c) = u(); // sub-in-sub
   |         ---------^^^^-----------------^
   |         |            |       |
   |         |            |       value is mutably borrowed by `c` here
   |         |            value is borrowed by `b` here
   |         value is mutably borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:33:22
   |
LL |     let ref mut a @ (ref b @ ref mut c) = u(); // sub-in-sub
   |                      -----^^^---------
   |                      |       |
   |                      |       value is mutably borrowed by `c` here
   |                      value is borrowed by `b` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:37:9
   |
LL |     let ref a @ ref mut b = U;
   |         -----^^^---------
   |         |       |
   |         |       value is mutably borrowed by `b` here
   |         value is borrowed by `a` here

error: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:39:9
   |
LL |     let ref mut a @ ref b = U;
   |         ---------^^^-----
   |         |           |
   |         |           value is borrowed by `b` here
   |         value is mutably borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:41:9
   |
LL |     let ref a @ (ref mut b, ref mut c) = (U, U);
   |         -----^^^^---------^^---------^
   |         |        |          |
   |         |        |          value is mutably borrowed by `c` here
   |         |        value is mutably borrowed by `b` here
   |         value is borrowed by `a` here

error: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:43:9
   |
LL |     let ref mut a @ (ref b, ref c) = (U, U);
   |         ---------^^^^-----^^-----^
   |         |            |      |
   |         |            |      value is borrowed by `c` here
   |         |            value is borrowed by `b` here
   |         value is mutably borrowed by `a` here

error: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:46:9
   |
LL |     let ref mut a @ ref b = u();
   |         ---------^^^-----
   |         |           |
   |         |           value is borrowed by `b` here
   |         value is mutably borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:51:9
   |
LL |     let ref a @ ref mut b = u();
   |         -----^^^---------
   |         |       |
   |         |       value is mutably borrowed by `b` here
   |         value is borrowed by `a` here

error: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:57:9
   |
LL |     let ref mut a @ ref b = U;
   |         ---------^^^-----
   |         |           |
   |         |           value is borrowed by `b` here
   |         value is mutably borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:61:9
   |
LL |     let ref a @ ref mut b = U;
   |         -----^^^---------
   |         |       |
   |         |       value is mutably borrowed by `b` here
   |         value is borrowed by `a` here

error: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:67:9
   |
LL |         ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) => {
   |         ---------^^^^^^-----^
   |         |              |
   |         |              value is borrowed by `b` here
   |         value is mutably borrowed by `a` here

error: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:67:33
   |
LL |         ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) => {
   |                                 ---------^^^^^^^-----^
   |                                 |               |
   |                                 |               value is borrowed by `b` here
   |                                 value is mutably borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:76:9
   |
LL |         ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) => {
   |         -----^^^^^^---------^
   |         |          |
   |         |          value is mutably borrowed by `b` here
   |         value is borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:76:33
   |
LL |         ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) => {
   |                                 -----^^^^^^^---------^
   |                                 |           |
   |                                 |           value is mutably borrowed by `b` here
   |                                 value is borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:87:9
   |
LL |         ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { *b = U; false } => {}
   |         -----^^^^^^---------^
   |         |          |
   |         |          value is mutably borrowed by `b` here
   |         value is borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:87:33
   |
LL |         ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { *b = U; false } => {}
   |                                 -----^^^^^^^---------^
   |                                 |           |
   |                                 |           value is mutably borrowed by `b` here
   |                                 value is borrowed by `a` here

error: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:94:9
   |
LL |         ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { *a = Err(U); false } => {}
   |         ---------^^^^^^-----^
   |         |              |
   |         |              value is borrowed by `b` here
   |         value is mutably borrowed by `a` here

error: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:94:33
   |
LL |         ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { *a = Err(U); false } => {}
   |                                 ---------^^^^^^^-----^
   |                                 |               |
   |                                 |               value is borrowed by `b` here
   |                                 value is mutably borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:101:9
   |
LL |         ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
   |         -----^^^^^^---------^
   |         |          |
   |         |          value is mutably borrowed by `b` here
   |         value is borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:101:33
   |
LL |         ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
   |                                 -----^^^^^^^---------^
   |                                 |           |
   |                                 |           value is mutably borrowed by `b` here
   |                                 value is borrowed by `a` here

error: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:109:9
   |
LL |         ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { drop(a); false } => {}
   |         ---------^^^^^^-----^
   |         |              |
   |         |              value is borrowed by `b` here
   |         value is mutably borrowed by `a` here

error: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:109:33
   |
LL |         ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { drop(a); false } => {}
   |                                 ---------^^^^^^^-----^
   |                                 |               |
   |                                 |               value is borrowed by `b` here
   |                                 value is mutably borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:117:9
   |
LL |     let ref a @ (ref mut b, ref mut c) = (U, U);
   |         -----^^^^---------^^---------^
   |         |        |          |
   |         |        |          value is mutably borrowed by `c` here
   |         |        value is mutably borrowed by `b` here
   |         value is borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:123:9
   |
LL |     let ref a @ (ref mut b, ref mut c) = (U, U);
   |         -----^^^^---------^^---------^
   |         |        |          |
   |         |        |          value is mutably borrowed by `c` here
   |         |        value is mutably borrowed by `b` here
   |         value is borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:129:9
   |
LL |     let ref a @ (ref mut b, ref mut c) = (U, U);
   |         -----^^^^---------^^---------^
   |         |        |          |
   |         |        |          value is mutably borrowed by `c` here
   |         |        value is mutably borrowed by `b` here
   |         value is borrowed by `a` here

error: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:134:9
   |
LL |     let ref mut a @ (ref b, ref c) = (U, U);
   |         ---------^^^^-----^^-----^
   |         |            |      |
   |         |            |      value is borrowed by `c` here
   |         |            value is borrowed by `b` here
   |         value is mutably borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:22:11
   |
LL |     fn f1(ref a @ ref mut b: U) {}
   |           -----^^^---------
   |           |       |
   |           |       value is mutably borrowed by `b` here
   |           value is borrowed by `a` here

error: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:24:11
   |
LL |     fn f2(ref mut a @ ref b: U) {}
   |           ---------^^^-----
   |           |           |
   |           |           value is borrowed by `b` here
   |           value is mutably borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:26:11
   |
LL |     fn f3(ref a @ [ref b, ref mut mid @ .., ref c]: [U; 4]) {}
   |           -----^^^^^^^^^^^----------------^^^^^^^^
   |           |               |
   |           |               value is mutably borrowed by `mid` here
   |           value is borrowed by `a` here

error: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:28:22
   |
LL |     fn f4_also_moved(ref a @ ref mut b @ c: U) {}
   |                      -----^^^-------------
   |                      |       |           |
   |                      |       |           value is moved into `c` here
   |                      |       value is mutably borrowed by `b` here
   |                      value is borrowed by `a` here

error: cannot move out of value because it is borrowed
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:28:30
   |
LL |     fn f4_also_moved(ref a @ ref mut b @ c: U) {}
   |                              ---------^^^-
   |                              |           |
   |                              |           value is moved into `c` here
   |                              value is mutably borrowed by `b` here

error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:8:31
   |
LL |         ref mut z @ &mut Some(ref a) => {
   |         ---------             ^^^^^ immutable borrow occurs here
   |         |
   |         mutable borrow occurs here
...
LL |             **z = None;
   |             ---------- mutable borrow later used here

error[E0502]: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:46:9
   |
LL |     let ref mut a @ ref b = u();
   |         ^^^^^^^^^   ----- immutable borrow occurs here
   |         |
   |         mutable borrow occurs here
...
LL |     drop(b);
   |          - immutable borrow later used here

error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:51:9
   |
LL |     let ref a @ ref mut b = u();
   |         ^^^^^   --------- mutable borrow occurs here
   |         |
   |         immutable borrow occurs here
...
LL |     *b = u();
   |     -------- mutable borrow later used here

error[E0502]: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:76:20
   |
LL |         ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) => {
   |         -----      ^^^^^^^^^ mutable borrow occurs here
   |         |
   |         immutable borrow occurs here
...
LL |             drop(a);
   |                  - immutable borrow later used here

error[E0502]: cannot borrow value as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:76:45
   |
LL |         ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) => {
   |                                 -----       ^^^^^^^^^ mutable borrow occurs here
   |                                 |
   |                                 immutable borrow occurs here
...
LL |             drop(a);
   |                  - immutable borrow later used here

error[E0594]: cannot assign to `*b`, as it is immutable for the pattern guard
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:87:61
   |
LL |         ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { *b = U; false } => {}
   |                                                             ^^^^^^ cannot assign
   |
   = note: variables bound in patterns are immutable until the end of the pattern guard

error[E0594]: cannot assign to `*a`, as it is immutable for the pattern guard
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:94:61
   |
LL |         ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { *a = Err(U); false } => {}
   |                                                             ^^^^^^^^^^^ cannot assign
   |
   = note: variables bound in patterns are immutable until the end of the pattern guard

error[E0507]: cannot move out of `b` in pattern guard
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:101:66
   |
LL |         ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
   |                                                                  ^ move occurs because `b` has type `&mut U`, which does not implement the `Copy` trait
   |
   = note: variables bound in patterns cannot be moved from until after the end of the pattern guard

error[E0507]: cannot move out of `b` in pattern guard
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:101:66
   |
LL |         ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
   |                                                                  ^ move occurs because `b` has type `&mut U`, which does not implement the `Copy` trait
   |
   = note: variables bound in patterns cannot be moved from until after the end of the pattern guard

error[E0507]: cannot move out of `a` in pattern guard
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:109:66
   |
LL |         ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { drop(a); false } => {}
   |                                                                  ^ move occurs because `a` has type `&mut Result<U, U>`, which does not implement the `Copy` trait
   |
   = note: variables bound in patterns cannot be moved from until after the end of the pattern guard

error[E0507]: cannot move out of `a` in pattern guard
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:109:66
   |
LL |         ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { drop(a); false } => {}
   |                                                                  ^ move occurs because `a` has type `&mut Result<U, U>`, which does not implement the `Copy` trait
   |
   = note: variables bound in patterns cannot be moved from until after the end of the pattern guard

error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:117:9
   |
LL |     let ref a @ (ref mut b, ref mut c) = (U, U);
   |         ^^^^^    --------- mutable borrow occurs here
   |         |
   |         immutable borrow occurs here
...
LL |     *b = U;
   |     ------ mutable borrow later used here

error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:123:9
   |
LL |     let ref a @ (ref mut b, ref mut c) = (U, U);
   |         ^^^^^    --------- mutable borrow occurs here
   |         |
   |         immutable borrow occurs here
...
LL |     *b = U;
   |     ------ mutable borrow later used here

error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:129:9
   |
LL |     let ref a @ (ref mut b, ref mut c) = (U, U);
   |         ^^^^^    --------- mutable borrow occurs here
   |         |
   |         immutable borrow occurs here
LL |
LL |     *b = U;
   |     ------ mutable borrow later used here

error[E0382]: borrow of moved value
  --> $DIR/borrowck-pat-ref-mut-and-ref.rs:28:30
   |
LL |     fn f4_also_moved(ref a @ ref mut b @ c: U) {}
   |                      -----   ^^^^^^^^^   - value moved here
   |                      |       |
   |                      |       value borrowed here after move
   |                      move occurs because value has type `U`, which does not implement the `Copy` trait

error: aborting due to 47 previous errors

Some errors have detailed explanations: E0382, E0502, E0507, E0594.
For more information about an error, try `rustc --explain E0382`.