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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
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| `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
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| `foo` is moved here
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= 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 } => {},
| ++++++++
```
42 lines
1.1 KiB
Plaintext
42 lines
1.1 KiB
Plaintext
note: external requirements
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--> $DIR/escape-upvar-ref.rs:23:27
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LL | let mut closure = || p = &y;
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| ^^
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= note: defining type: test::{closure#0} with closure args [
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i16,
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extern "rust-call" fn(()),
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(&'?1 mut &'?2 i32, &'?3 i32),
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]
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= note: number of external vids: 4
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= note: where '?3: '?2
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note: no external requirements
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--> $DIR/escape-upvar-ref.rs:17:1
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LL | fn test() {
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| ^^^^^^^^^
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= note: defining type: test
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error[E0597]: `y` does not live long enough
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--> $DIR/escape-upvar-ref.rs:23:35
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LL | let y = 22;
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| - binding `y` declared here
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LL | let mut closure = || p = &y;
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| -- ^ borrowed value does not live long enough
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| value captured here
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...
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LL | }
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| - `y` dropped here while still borrowed
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LL |
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LL | deref(p);
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| - borrow later used here
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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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