mirror of https://github.com/rust-lang/rust
75 lines
2.5 KiB
Plaintext
75 lines
2.5 KiB
Plaintext
error[E0499]: cannot borrow `f` as mutable more than once at a time
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--> $DIR/borrowck-call-is-borrow-issue-12224.rs:12:16
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LL | f(Box::new(|| {
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| - ^^ second mutable borrow occurs here
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| first mutable borrow occurs here
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| first borrow later used by call
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LL |
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LL | f((Box::new(|| {})))
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| - second borrow occurs due to use of `f` in closure
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error[E0596]: cannot borrow `*f` as mutable, as it is behind a `&` reference
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--> $DIR/borrowck-call-is-borrow-issue-12224.rs:25:5
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LL | (*f)();
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| ^^^^ `f` is a `&` reference, so the data it refers to cannot be borrowed as mutable
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help: consider changing this to be a mutable reference
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LL | fn test2<F>(f: &mut F) where F: FnMut() {
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| +++
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error[E0596]: cannot borrow `f.f` as mutable, as it is behind a `&` reference
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--> $DIR/borrowck-call-is-borrow-issue-12224.rs:34:5
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LL | f.f.call_mut(())
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| ^^^ `f` is a `&` reference, so the data it refers to cannot be borrowed as mutable
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help: consider changing this to be a mutable reference
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LL | fn test4(f: &mut Test) {
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| +++
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error[E0507]: cannot move out of `f`, a captured variable in an `FnMut` closure
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--> $DIR/borrowck-call-is-borrow-issue-12224.rs:57:13
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LL | let mut f = move |g: Box<dyn FnMut(isize)>, b: isize| {
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| ----- captured outer variable
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...
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LL | f(Box::new(|a| {
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| --- captured by this `FnMut` closure
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LL |
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LL | foo(f);
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| ^ move occurs because `f` has type `{closure@$DIR/borrowck-call-is-borrow-issue-12224.rs:52:17: 52:58}`, which does not implement the `Copy` trait
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help: consider cloning the value if the performance cost is acceptable
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LL | foo(f.clone());
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| ++++++++
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error[E0505]: cannot move out of `f` because it is borrowed
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--> $DIR/borrowck-call-is-borrow-issue-12224.rs:55:16
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LL | let mut f = move |g: Box<dyn FnMut(isize)>, b: isize| {
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| ----- binding `f` declared here
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...
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LL | f(Box::new(|a| {
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| - ^^^ move out of `f` occurs here
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| |
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| borrow of `f` occurs here
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LL |
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LL | foo(f);
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| - move occurs due to use in closure
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help: consider cloning the value if the performance cost is acceptable
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LL | f.clone()(Box::new(|a| {
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| ++++++++
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error: aborting due to 5 previous errors
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Some errors have detailed explanations: E0499, E0505, E0507, E0596.
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For more information about an error, try `rustc --explain E0499`.
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