error[E0524]: two closures require unique access to `x` at the same time
  --> $DIR/borrowck-closures-mut-of-imm.rs:25:14
   |
LL |     let c1 = || set(&mut *x);
   |              --           - previous borrow occurs due to use of `x` in closure
   |              |
   |              first closure is constructed here
LL |     //~^ ERROR cannot borrow
LL |     let c2 = || set(&mut *x);
   |              ^^           - borrow occurs due to use of `x` in closure
   |              |
   |              second closure is constructed here
...
LL | }
   | - borrow from first closure ends here

error[E0596]: cannot borrow immutable borrowed content `***x` as mutable
  --> $DIR/borrowck-closures-mut-of-imm.rs:23:26
   |
LL |     let c1 = || set(&mut *x);
   |                          ^^ cannot borrow as mutable

error[E0596]: cannot borrow immutable borrowed content `***x` as mutable
  --> $DIR/borrowck-closures-mut-of-imm.rs:25:26
   |
LL |     let c2 = || set(&mut *x);
   |                          ^^ cannot borrow as mutable

error: aborting due to 3 previous errors

Some errors occurred: E0524, E0596.
For more information about an error, try `rustc --explain E0524`.