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+error[E0502]: cannot borrow `f` as immutable because it is also borrowed as mutable
+ --> $DIR/borrowck-unboxed-closures.rs:3:5
+ |
+LL | let g = &mut f;
+ | ------ mutable borrow occurs here
+LL | f(1, 2);
+ | ^ immutable borrow occurs here
+LL | use_mut(g);
+ | - mutable borrow later used here
+
+error[E0596]: cannot borrow `f` as mutable, as it is not declared as mutable
+ --> $DIR/borrowck-unboxed-closures.rs:7:5
+ |
+LL | f(1, 2);
+ | ^ cannot borrow as mutable
+ |
+help: consider changing this to be mutable
+ |
+LL | fn b<F:FnMut(isize, isize) -> isize>(mut f: F) {
+ | +++
+
+error[E0382]: use of moved value: `f`
+ --> $DIR/borrowck-unboxed-closures.rs:12:5
+ |
+LL | fn c<F:FnOnce(isize, isize) -> isize>(f: F) {
+ | - move occurs because `f` has type `F`, which does not implement the `Copy` trait
+LL | f(1, 2);
+ | ------- `f` moved due to this call
+LL | f(1, 2);
+ | ^ value used here after move
+ |
+note: this value implements `FnOnce`, which causes it to be moved when called
+ --> $DIR/borrowck-unboxed-closures.rs:11:5
+ |
+LL | f(1, 2);
+ | ^
+help: consider further restricting this bound
+ |
+LL | fn c<F:FnOnce(isize, isize) -> isize + Copy>(f: F) {
+ | ++++++
+
+error: aborting due to 3 previous errors
+
+Some errors have detailed explanations: E0382, E0502, E0596.
+For more information about an error, try `rustc --explain E0382`.