mirror of https://github.com/rust-lang/rust
66 lines
2.6 KiB
Plaintext
66 lines
2.6 KiB
Plaintext
error[E0597]: `factorial` does not live long enough
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--> $DIR/unboxed-closures-failed-recursive-fn-1.rs:15:17
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LL | let mut factorial: Option<Box<dyn Fn(u32) -> u32>> = None;
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| ------------- binding `factorial` declared here
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LL |
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LL | let f = |x: u32| -> u32 {
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| --------------- value captured here
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LL | let g = factorial.as_ref().unwrap();
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| ^^^^^^^^^ borrowed value does not live long enough
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...
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LL | }
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| -
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| `factorial` dropped here while still borrowed
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| borrow might be used here, when `factorial` is dropped and runs the destructor for type `Option<Box<dyn Fn(u32) -> u32>>`
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error[E0506]: cannot assign to `factorial` because it is borrowed
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--> $DIR/unboxed-closures-failed-recursive-fn-1.rs:20:5
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LL | let f = |x: u32| -> u32 {
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| --------------- `factorial` is borrowed here
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LL | let g = factorial.as_ref().unwrap();
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| --------- borrow occurs due to use in closure
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...
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LL | factorial = Some(Box::new(f));
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| ^^^^^^^^^
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| |
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| `factorial` is assigned to here but it was already borrowed
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| borrow later used here
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error[E0597]: `factorial` does not live long enough
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--> $DIR/unboxed-closures-failed-recursive-fn-1.rs:28:17
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LL | let mut factorial: Option<Box<dyn Fn(u32) -> u32 + 'static>> = None;
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| ------------- ----------------------------------------- type annotation requires that `factorial` is borrowed for `'static`
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| |
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| binding `factorial` declared here
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LL |
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LL | let f = |x: u32| -> u32 {
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| --------------- value captured here
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LL | let g = factorial.as_ref().unwrap();
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| ^^^^^^^^^ borrowed value does not live long enough
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...
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LL | }
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| - `factorial` dropped here while still borrowed
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error[E0506]: cannot assign to `factorial` because it is borrowed
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--> $DIR/unboxed-closures-failed-recursive-fn-1.rs:33:5
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LL | let mut factorial: Option<Box<dyn Fn(u32) -> u32 + 'static>> = None;
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| ----------------------------------------- type annotation requires that `factorial` is borrowed for `'static`
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LL |
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LL | let f = |x: u32| -> u32 {
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| --------------- `factorial` is borrowed here
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LL | let g = factorial.as_ref().unwrap();
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| --------- borrow occurs due to use in closure
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...
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LL | factorial = Some(Box::new(f));
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| ^^^^^^^^^ `factorial` is assigned to here but it was already borrowed
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error: aborting due to 4 previous errors
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Some errors have detailed explanations: E0506, E0597.
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For more information about an error, try `rustc --explain E0506`.
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