error[E0502]: cannot borrow `*map` as mutable because it is also borrowed as immutable (Ast)
  --> $DIR/get_default.rs:33:17
   |
LL |         match map.get() {
   |               --- immutable borrow occurs here
...
LL |                 map.set(String::new()); // Just AST errors here
   |                 ^^^ mutable borrow occurs here
...
LL | }
   | - immutable borrow ends here

error[E0502]: cannot borrow `*map` as mutable because it is also borrowed as immutable (Ast)
  --> $DIR/get_default.rs:44:17
   |
LL |         match map.get() {
   |               --- immutable borrow occurs here
LL |             Some(v) => {
LL |                 map.set(String::new()); // Both AST and MIR error here
   |                 ^^^ mutable borrow occurs here
...
LL | }
   | - immutable borrow ends here

error[E0502]: cannot borrow `*map` as mutable because it is also borrowed as immutable (Ast)
  --> $DIR/get_default.rs:50:17
   |
LL |         match map.get() {
   |               --- immutable borrow occurs here
...
LL |                 map.set(String::new()); // Just AST errors here
   |                 ^^^ mutable borrow occurs here
...
LL | }
   | - immutable borrow ends here

error[E0502]: cannot borrow `*map` as mutable because it is also borrowed as immutable (Mir)
  --> $DIR/get_default.rs:44:17
   |
LL |         match map.get() {
   |               --- immutable borrow occurs here
LL |             Some(v) => {
LL |                 map.set(String::new()); // Both AST and MIR error here
   |                 ^^^ mutable borrow occurs here
...
LL |                 return v;
   |                        - borrow later used here

error: aborting due to 4 previous errors

If you want more information on this error, try using "rustc --explain E0502"