mirror of
https://github.com/rust-lang/rust
synced 2024-10-14 12:33:57 +00:00
065454dd1d
```
error[E0507]: cannot move out of `val`, a captured variable in an `FnMut` closure
--> $DIR/issue-87456-point-to-closure.rs:10:28
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LL | let val = String::new();
| --- captured outer variable
LL |
LL | take_mut(|| {
| -- captured by this `FnMut` closure
LL |
LL | let _foo: String = val;
| ^^^ move occurs because `val` has type `String`, which does not implement the `Copy` trait
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help: consider borrowing here
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LL | let _foo: String = &val;
| +
help: consider cloning the value if the performance cost is acceptable
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LL | let _foo: String = val.clone();
| ++++++++
```
98 lines
2.7 KiB
Rust
98 lines
2.7 KiB
Rust
#![feature(box_patterns)]
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fn a() {
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let mut vec = [Box::new(1), Box::new(2), Box::new(3)];
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match vec {
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[box ref _a, _, _] => {
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//~^ NOTE `vec[_]` is borrowed here
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vec[0] = Box::new(4); //~ ERROR cannot assign
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//~^ NOTE `vec[_]` is assigned to here
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_a.use_ref();
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//~^ NOTE borrow later used here
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}
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}
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}
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fn b() {
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let mut vec = vec![Box::new(1), Box::new(2), Box::new(3)];
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let vec: &mut [Box<isize>] = &mut vec;
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match vec {
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&mut [ref _b @ ..] => {
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//~^ `vec[_]` is borrowed here
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vec[0] = Box::new(4); //~ ERROR cannot assign
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//~^ NOTE `vec[_]` is assigned to here
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_b.use_ref();
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//~^ NOTE borrow later used here
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}
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}
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}
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fn c() {
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let mut vec = vec![Box::new(1), Box::new(2), Box::new(3)];
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let vec: &mut [Box<isize>] = &mut vec;
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match vec {
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//~^ ERROR cannot move out
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//~| NOTE cannot move out
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&mut [_a,
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//~^ NOTE data moved here
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//~| NOTE move occurs because `_a` has type
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//~| HELP consider removing the mutable borrow
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..
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] => {
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}
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_ => {}
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}
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let a = vec[0]; //~ ERROR cannot move out
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//~| NOTE cannot move out of here
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//~| NOTE move occurs because
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//~| HELP consider borrowing here
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//~| HELP consider cloning
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}
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fn d() {
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let mut vec = vec![Box::new(1), Box::new(2), Box::new(3)];
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let vec: &mut [Box<isize>] = &mut vec;
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match vec {
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//~^ ERROR cannot move out
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//~| NOTE cannot move out
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&mut [
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//~^ HELP consider removing the mutable borrow
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_b] => {}
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//~^ NOTE data moved here
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//~| NOTE move occurs because `_b` has type
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_ => {}
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}
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let a = vec[0]; //~ ERROR cannot move out
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//~| NOTE cannot move out of here
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//~| NOTE move occurs because
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//~| HELP consider borrowing here
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//~| HELP consider cloning
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}
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fn e() {
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let mut vec = vec![Box::new(1), Box::new(2), Box::new(3)];
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let vec: &mut [Box<isize>] = &mut vec;
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match vec {
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//~^ ERROR cannot move out
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//~| NOTE cannot move out
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//~| NOTE move occurs because these variables have types
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&mut [_a, _b, _c] => {}
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//~^ NOTE data moved here
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//~| NOTE and here
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//~| NOTE and here
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//~| HELP consider removing the mutable borrow
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_ => {}
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}
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let a = vec[0]; //~ ERROR cannot move out
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//~| NOTE cannot move out of here
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//~| NOTE move occurs because
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//~| HELP consider borrowing here
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//~| HELP consider cloning
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}
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fn main() {}
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trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { } }
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impl<T> Fake for T { }
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