error[E0500]: closure requires unique access to `x` but it is already borrowed
  --> $DIR/borrowck-closures-unique.rs:26:14
   |
LL |     let c1 = || get(x);
   |              --     - first borrow occurs due to use of `x` in closure
   |              |
   |              borrow occurs here
LL |     let c2 = || set(x);
   |              ^^     - second borrow occurs due to use of `x` in closure
   |              |
   |              closure construction occurs here
LL |     c1;
   |     -- first borrow later used here

error[E0500]: closure requires unique access to `x` but it is already borrowed
  --> $DIR/borrowck-closures-unique.rs:32:14
   |
LL |     let c1 = || get(x);
   |              --     - first borrow occurs due to use of `x` in closure
   |              |
   |              borrow occurs here
LL |     let c2 = || { get(x); set(x); };
   |              ^^               - second borrow occurs due to use of `x` in closure
   |              |
   |              closure construction occurs here
LL |     c1;
   |     -- first borrow later used here

error[E0524]: two closures require unique access to `x` at the same time
  --> $DIR/borrowck-closures-unique.rs:38:14
   |
LL |     let c1 = || set(x);
   |              --     - first borrow occurs due to use of `x` in closure
   |              |
   |              first closure is constructed here
LL |     let c2 = || set(x);
   |              ^^     - second borrow occurs due to use of `x` in closure
   |              |
   |              second closure is constructed here
LL |     c1;
   |     -- first borrow later used here

error[E0594]: cannot assign to `x`, as it is not declared as mutable
  --> $DIR/borrowck-closures-unique.rs:43:38
   |
LL |     let c1 = |y: &'static mut isize| x = y;
   |                                      ^^^^^ cannot assign
   |
help: consider changing this to be mutable
   |
LL | fn e(mut x: &'static mut isize) {
   |      +++

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0500, E0524, E0594.
For more information about an error, try `rustc --explain E0500`.