error[E0502]: cannot borrow `v` as mutable because it is also borrowed as immutable
  --> $DIR/fake_borrows.rs:9:16
   |
LL |     match v {
   |           - immutable borrow occurs here
LL |         deref!([true]) => {}
LL |         _ if { v[0] = true; false } => {}
   |                ^                  - immutable borrow later used here
   |                |
   |                mutable borrow occurs here

error[E0502]: cannot borrow `v` as mutable because it is also borrowed as immutable
  --> $DIR/fake_borrows.rs:16:16
   |
LL |     match v {
   |           - immutable borrow occurs here
LL |         [true] => {}
LL |         _ if { v[0] = true; false } => {}
   |                ^                  - immutable borrow later used here
   |                |
   |                mutable borrow occurs here

error[E0510]: cannot assign `*b` in match guard
  --> $DIR/fake_borrows.rs:26:16
   |
LL |     match b {
   |           - value is immutable in match guard
LL |         deref!(true) => {}
LL |         _ if { *b = true; false } => {}
   |                ^^^^^^^^^ cannot assign

error[E0510]: cannot assign `*b` in match guard
  --> $DIR/fake_borrows.rs:33:16
   |
LL |     match b {
   |           - value is immutable in match guard
LL |         true => {}
LL |         _ if { *b = true; false } => {}
   |                ^^^^^^^^^ cannot assign

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0502, E0510.
For more information about an error, try `rustc --explain E0502`.