rust/tests/ui/nll/issue-42574-diagnostic-in-nested-closure.stderr
Esteban Küber 4aba2c55e6 Modify find_expr from Span to better account for closures
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
   |
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 } => {},
   |                                         ++++++++
```
2024-04-24 22:21:13 +00:00

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Plaintext

error: lifetime may not live long enough
--> $DIR/issue-42574-diagnostic-in-nested-closure.rs:6:8
|
LL | || doit(data);
| -- ^^^^^^^^^^ argument requires that `'1` must outlive `'static`
| |
| lifetime `'1` represents this closure's body
|
= note: closure implements `FnMut`, so references to captured variables can't escape the closure
error[E0597]: `data` does not live long enough
--> $DIR/issue-42574-diagnostic-in-nested-closure.rs:6:13
|
LL | fn doit(data: &'static mut ()) {
| ---- binding `data` declared here
LL | || doit(data);
| -- -----^^^^-
| | | |
| | | borrowed value does not live long enough
| | argument requires that `data` is borrowed for `'static`
| value captured here
...
LL | }
| - `data` dropped here while still borrowed
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0597`.