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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
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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 | fn b<F:FnMut(isize, isize) -> isize>(f: F) {
| - help: consider changing this to be mutable: `mut f`
LL | f(1, 2);
| ^ cannot borrow as mutable
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`.
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