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https://github.com/rust-lang/rust
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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
| |
| `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 } => {},
| ++++++++
```
28 lines
963 B
Text
28 lines
963 B
Text
error: lifetime may not live long enough
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--> $DIR/issue-42574-diagnostic-in-nested-closure.rs:6:8
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LL | || doit(data);
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| -- ^^^^^^^^^^ argument requires that `'1` must outlive `'static`
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| lifetime `'1` represents this closure's body
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= note: closure implements `FnMut`, so references to captured variables can't escape the closure
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error[E0597]: `data` does not live long enough
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--> $DIR/issue-42574-diagnostic-in-nested-closure.rs:6:13
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LL | fn doit(data: &'static mut ()) {
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| ---- binding `data` declared here
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LL | || doit(data);
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| -- -----^^^^-
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| | | borrowed value does not live long enough
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| | argument requires that `data` is borrowed for `'static`
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| value captured here
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...
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LL | }
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| - `data` dropped here while still borrowed
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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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