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https://github.com/rust-lang/rust
synced 2024-09-30 22:04:36 +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
|
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
|
LL | if { (|| { let mut bar = foo.clone(); bar.take() })(); false } => {},
| ++++++++
```
18 lines
612 B
Plaintext
18 lines
612 B
Plaintext
error[E0597]: `i` does not live long enough
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--> $DIR/regions-steal-closure.rs:14:28
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LL | let mut cl_box = {
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| ---------- borrow later stored here
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LL | let mut i = 3;
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| ----- binding `i` declared here
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LL | box_it(Box::new(|| i += 1))
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| -- ^ borrowed value does not live long enough
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| value captured here
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LL | };
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| - `i` dropped here while still borrowed
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0597`.
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