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
|
LL | if { (|| { let mut bar = foo.clone(); bar.take() })(); false } => {},
| ++++++++
```
179 lines
5.8 KiB
Plaintext
179 lines
5.8 KiB
Plaintext
error[E0505]: cannot move out of `x` because it is borrowed
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--> $DIR/closure-borrow-spans.rs:5:13
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LL | let f = || x.len();
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| -- - borrow occurs due to use in closure
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| borrow of `x` occurs here
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LL | let y = x;
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| ^ move out of `x` occurs here
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LL | f.use_ref();
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| - borrow later used here
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error[E0502]: cannot borrow `x` as mutable because it is also borrowed as immutable
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--> $DIR/closure-borrow-spans.rs:11:13
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LL | let f = || x;
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| -- - first borrow occurs due to use of `x` in closure
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| immutable borrow occurs here
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LL | let y = &mut x;
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| ^^^^^^ mutable borrow occurs here
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LL | f.use_ref();
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| - immutable borrow later used here
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error[E0597]: `x` does not live long enough
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--> $DIR/closure-borrow-spans.rs:19:16
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LL | let x = 1;
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| - binding `x` declared here
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LL | f = || x;
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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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| - `x` dropped here while still borrowed
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LL | f.use_ref();
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| - borrow later used here
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error[E0506]: cannot assign to `x` because it is borrowed
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--> $DIR/closure-borrow-spans.rs:26:5
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LL | let f = || x;
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| -- - borrow occurs due to use in closure
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| `x` is borrowed here
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LL | x = 1;
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| ^^^^^ `x` is assigned to here but it was already borrowed
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LL | f.use_ref();
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| - borrow later used here
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error[E0503]: cannot use `x` because it was mutably borrowed
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--> $DIR/closure-borrow-spans.rs:32:13
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LL | let f = || x = 0;
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| -- - borrow occurs due to use of `x` in closure
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| `x` is borrowed here
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LL | let y = x;
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| ^ use of borrowed `x`
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LL | f.use_ref();
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| - borrow later used here
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error[E0502]: cannot borrow `x` as immutable because it is also borrowed as mutable
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--> $DIR/closure-borrow-spans.rs:38:13
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LL | let f = || x = 0;
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| -- - first borrow occurs due to use of `x` in closure
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| mutable borrow occurs here
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LL | let y = &x;
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| ^^ immutable borrow occurs here
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LL | f.use_ref();
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| - mutable borrow later used here
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error[E0499]: cannot borrow `x` as mutable more than once at a time
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--> $DIR/closure-borrow-spans.rs:44:13
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LL | let f = || x = 0;
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| -- - first borrow occurs due to use of `x` in closure
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| first mutable borrow occurs here
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LL | let y = &mut x;
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| ^^^^^^ second mutable borrow occurs here
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LL | f.use_ref();
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| - first borrow later used here
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error[E0597]: `x` does not live long enough
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--> $DIR/closure-borrow-spans.rs:52:16
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LL | let mut x = 1;
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| ----- binding `x` declared here
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LL | f = || x = 0;
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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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| - `x` dropped here while still borrowed
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LL | f.use_ref();
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| - borrow later used here
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error[E0506]: cannot assign to `x` because it is borrowed
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--> $DIR/closure-borrow-spans.rs:59:5
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LL | let f = || x = 0;
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| -- - borrow occurs due to use in closure
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| `x` is borrowed here
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LL | x = 1;
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| ^^^^^ `x` is assigned to here but it was already borrowed
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LL | f.use_ref();
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| - borrow later used here
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error[E0505]: cannot move out of `x` because it is borrowed
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--> $DIR/closure-borrow-spans.rs:65:13
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LL | let f = || *x = 0;
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| -- -- borrow occurs due to use in closure
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| borrow of `x` occurs here
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LL | let y = x;
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| ^ move out of `x` occurs here
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LL | f.use_ref();
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| - borrow later used here
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error[E0501]: cannot borrow `x` as immutable because previous closure requires unique access
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--> $DIR/closure-borrow-spans.rs:71:13
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LL | let f = || *x = 0;
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| -- -- first borrow occurs due to use of `x` in closure
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| closure construction occurs here
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LL | let y = &x;
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| ^^ second borrow occurs here
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LL | f.use_ref();
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| - first borrow later used here
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error[E0501]: cannot borrow `x` as mutable because previous closure requires unique access
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--> $DIR/closure-borrow-spans.rs:77:13
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LL | let f = || *x = 0;
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| -- -- first borrow occurs due to use of `x` in closure
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| closure construction occurs here
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LL | let y = &mut x;
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| ^^^^^^ second borrow occurs here
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LL | f.use_ref();
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| - first borrow later used here
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error[E0597]: `x` does not live long enough
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--> $DIR/closure-borrow-spans.rs:86:16
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LL | let x = &mut z;
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| - binding `x` declared here
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LL | f = || *x = 0;
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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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| - `x` dropped here while still borrowed
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LL | f.use_ref();
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| - borrow later used here
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error[E0506]: cannot assign to `*x` because it is borrowed
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--> $DIR/closure-borrow-spans.rs:93:5
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LL | let f = || *x = 0;
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| -- -- borrow occurs due to use in closure
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| `*x` is borrowed here
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LL | *x = 1;
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| ^^^^^^ `*x` is assigned to here but it was already borrowed
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LL | f.use_ref();
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| - borrow later used here
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error: aborting due to 14 previous errors
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Some errors have detailed explanations: E0499, E0501, E0502, E0503, E0505, E0506, E0597.
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For more information about an error, try `rustc --explain E0499`.
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