tests/ui/pattern/mut-pattern-of-immutable-borrow.stderr

error[E0507]: cannot move out of `arg.field` as enum variant `Some` which is behind a mutable reference
  --> $DIR/mut-pattern-of-immutable-borrow.rs:6:11
   |
LL |     match arg.field {
   |           ^^^^^^^^^
LL |         Some(s) => s.push('a'),
   |              -
   |              |
   |              data moved here
   |              move occurs because `s` has type `String`, which does not implement the `Copy` trait
   |
help: consider borrowing here
   |
LL |     match &arg.field {
   |           +

error[E0596]: cannot borrow `s` as mutable, as it is not declared as mutable
  --> $DIR/mut-pattern-of-immutable-borrow.rs:7:20
   |
LL |         Some(s) => s.push('a'),
   |                    ^ cannot borrow as mutable
   |
help: consider changing this to be mutable
   |
LL |         Some(mut s) => s.push('a'),
   |              +++

error[E0507]: cannot move out of a shared reference
  --> $DIR/mut-pattern-of-immutable-borrow.rs:12:11
   |
LL |     match &arg.field {
   |           ^^^^^^^^^^
LL |         Some(mut s) => s.push('a'),
   |              -----
   |              |
   |              data moved here
   |              move occurs because `s` has type `String`, which does not implement the `Copy` trait
   |
help: consider borrowing the pattern binding
   |
LL |         Some(ref mut s) => s.push('a'),
   |              +++

error[E0596]: cannot borrow data in a `&` reference as mutable
  --> $DIR/mut-pattern-of-immutable-borrow.rs:19:14
   |
LL |     match &arg.field {
   |           ---------- this cannot be borrowed as mutable
LL |         Some(ref mut s) => s.push('a'),
   |              ^^^^^^^^^ cannot borrow as mutable

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0507, E0596.
For more information about an error, try `rustc --explain E0507`.