mirror of
https://github.com/rust-lang/rust
synced 2024-10-14 20:46:49 +00:00
4aba2c55e6
Start pointing to where bindings were declared when they are captured in closures:
```
error[E0597]: `x` does not live long enough
--> $DIR/suggest-return-closure.rs:23:9
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LL | let x = String::new();
| - binding `x` declared here
...
LL | |c| {
| --- value captured here
LL | x.push(c);
| ^ borrowed value does not live long enough
...
LL | }
| -- borrow later used here
| |
| `x` dropped here while still borrowed
```
Suggest cloning in more cases involving closures:
```
error[E0507]: cannot move out of `foo` in pattern guard
--> $DIR/issue-27282-move-ref-mut-into-guard.rs:11:19
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LL | if { (|| { let mut bar = foo; bar.take() })(); false } => {},
| ^^ --- move occurs because `foo` has type `&mut Option<&i32>`, which does not implement the `Copy` trait
| |
| `foo` is moved here
|
= note: variables bound in patterns cannot be moved from until after the end of the pattern guard
help: consider cloning the value if the performance cost is acceptable
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LL | if { (|| { let mut bar = foo.clone(); bar.take() })(); false } => {},
| ++++++++
```
41 lines
1.4 KiB
Plaintext
41 lines
1.4 KiB
Plaintext
error[E0597]: `*cell` does not live long enough
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--> $DIR/dropck.rs:10:40
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LL | let (mut gen, cell);
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| ---- binding `cell` declared here
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LL | cell = Box::new(RefCell::new(0));
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LL | let ref_ = Box::leak(Box::new(Some(cell.borrow_mut())));
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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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| `*cell` dropped here while still borrowed
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| borrow might be used here, when `gen` is dropped and runs the destructor for coroutine
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= note: values in a scope are dropped in the opposite order they are defined
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error[E0597]: `ref_` does not live long enough
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--> $DIR/dropck.rs:16:18
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LL | let ref_ = Box::leak(Box::new(Some(cell.borrow_mut())));
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| ---- binding `ref_` declared here
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...
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LL | || {
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| -- value captured here by coroutine
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LL | // but the coroutine can use it to drop a `Ref<'a, i32>`.
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LL | let _d = ref_.take();
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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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| `ref_` dropped here while still borrowed
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| borrow might be used here, when `gen` is dropped and runs the destructor for coroutine
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= note: values in a scope are dropped in the opposite order they are defined
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error: aborting due to 2 previous errors
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For more information about this error, try `rustc --explain E0597`.
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