4ca876b7a4
```
error[E0382]: use of moved value: `blk`
--> $DIR/once-cant-call-twice-on-heap.rs:8:5
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LL | fn foo<F:FnOnce()>(blk: F) {
| --- move occurs because `blk` has type `F`, which does not implement the `Copy` trait
LL | blk();
| ----- `blk` moved due to this call
LL | blk();
| ^^^ value used here after move
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note: `FnOnce` closures can only be called once
--> $DIR/once-cant-call-twice-on-heap.rs:6:10
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LL | fn foo<F:FnOnce()>(blk: F) {
| ^^^^^^^^ `F` is made to be an `FnOnce` closure here
LL | blk();
| ----- this value implements `FnOnce`, which causes it to be moved when called
```
44 lines
1.5 KiB
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44 lines
1.5 KiB
Plaintext
error[E0502]: cannot borrow `f` as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-unboxed-closures.rs:3:5
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LL | let g = &mut f;
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| ------ mutable borrow occurs here
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LL | f(1, 2);
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| ^ immutable borrow occurs here
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LL | use_mut(g);
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| - mutable borrow later used here
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error[E0596]: cannot borrow `f` as mutable, as it is not declared as mutable
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--> $DIR/borrowck-unboxed-closures.rs:7:5
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LL | f(1, 2);
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| ^ cannot borrow as mutable
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help: consider changing this to be mutable
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LL | fn b<F:FnMut(isize, isize) -> isize>(mut f: F) {
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| +++
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error[E0382]: use of moved value: `f`
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--> $DIR/borrowck-unboxed-closures.rs:12:5
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LL | fn c<F:FnOnce(isize, isize) -> isize>(f: F) {
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| - move occurs because `f` has type `F`, which does not implement the `Copy` trait
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LL | f(1, 2);
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| ------- `f` moved due to this call
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LL | f(1, 2);
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| ^ value used here after move
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note: `FnOnce` closures can only be called once
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--> $DIR/borrowck-unboxed-closures.rs:10:8
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LL | fn c<F:FnOnce(isize, isize) -> isize>(f: F) {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `F` is made to be an `FnOnce` closure here
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LL | f(1, 2);
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| ------- this value implements `FnOnce`, which causes it to be moved when called
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error: aborting due to 3 previous errors
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Some errors have detailed explanations: E0382, E0502, E0596.
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For more information about an error, try `rustc --explain E0382`.
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