d68f2a6b71
```
error[E0382]: use of moved value: `t`
--> $DIR/use_of_moved_value_copy_suggestions.rs:7:9
|
LL | fn duplicate_t<T>(t: T) -> (T, T) {
| - move occurs because `t` has type `T`, which does not implement the `Copy` trait
...
LL | (t, t)
| - ^ value used here after move
| |
| value moved here
|
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/use_of_moved_value_copy_suggestions.rs:4:16
|
LL | fn duplicate_t<T>(t: T) -> (T, T) {
| ^ consider constraining this type parameter with `Clone`
...
LL | (t, t)
| - you could clone this value
help: consider restricting type parameter `T`
|
LL | fn duplicate_t<T: Copy>(t: T) -> (T, T) {
| ++++++
```
The `help` is new. On ADTs, we also extend the output with span labels:
```
error[E0507]: cannot move out of static item `FOO`
--> $DIR/issue-17718-static-move.rs:6:14
|
LL | let _a = FOO;
| ^^^ move occurs because `FOO` has type `Foo`, which does not implement the `Copy` trait
|
note: if `Foo` implemented `Clone`, you could clone the value
--> $DIR/issue-17718-static-move.rs:1:1
|
LL | struct Foo;
| ^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let _a = FOO;
| --- you could clone this value
help: consider borrowing here
|
LL | let _a = &FOO;
| +
```
466 lines
20 KiB
Plaintext
466 lines
20 KiB
Plaintext
error: cannot borrow value as immutable because it is also borrowed as mutable
|
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:8:9
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LL | ref mut z @ &mut Some(ref a) => {
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| ^^^^^^^^^ ----- value is borrowed by `a` here
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| |
|
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| value is mutably borrowed by `z` here
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error: cannot borrow value as mutable more than once at a time
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:33:9
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LL | let ref mut a @ (ref b @ ref mut c) = u(); // sub-in-sub
|
|
| ^^^^^^^^^ ----- --------- value is mutably borrowed by `c` here
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|
| | |
|
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| | value is borrowed by `b` here
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| value is mutably borrowed by `a` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:33:22
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LL | let ref mut a @ (ref b @ ref mut c) = u(); // sub-in-sub
|
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| ^^^^^ --------- value is mutably borrowed by `c` here
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| |
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| value is borrowed by `b` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:37:9
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LL | let ref a @ ref mut b = U;
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| ^^^^^ --------- value is mutably borrowed by `b` here
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| |
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| value is borrowed by `a` here
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error: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:39:9
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LL | let ref mut a @ ref b = U;
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| ^^^^^^^^^ ----- value is borrowed by `b` here
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| |
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| value is mutably borrowed by `a` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:41:9
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LL | let ref a @ (ref mut b, ref mut c) = (U, U);
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|
| ^^^^^ --------- --------- value is mutably borrowed by `c` here
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| | |
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| | value is mutably borrowed by `b` here
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| value is borrowed by `a` here
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error: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:43:9
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LL | let ref mut a @ (ref b, ref c) = (U, U);
|
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| ^^^^^^^^^ ----- ----- value is borrowed by `c` here
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| | |
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| | value is borrowed by `b` here
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| value is mutably borrowed by `a` here
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error: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:46:9
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LL | let ref mut a @ ref b = u();
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| ^^^^^^^^^ ----- value is borrowed by `b` here
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| |
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| value is mutably borrowed by `a` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:51:9
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LL | let ref a @ ref mut b = u();
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| ^^^^^ --------- value is mutably borrowed by `b` here
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| value is borrowed by `a` here
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error: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:57:9
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LL | let ref mut a @ ref b = U;
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| ^^^^^^^^^ ----- value is borrowed by `b` here
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| value is mutably borrowed by `a` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:61:9
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LL | let ref a @ ref mut b = U;
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| ^^^^^ --------- value is mutably borrowed by `b` here
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| value is borrowed by `a` here
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error: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:67:9
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LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) => {
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| ^^^^^^^^^ ----- value is borrowed by `b` here
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| |
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| value is mutably borrowed by `a` here
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error: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:67:33
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LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) => {
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| ^^^^^^^^^ ----- value is borrowed by `b` here
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| value is mutably borrowed by `a` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:76:9
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) => {
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| ^^^^^ --------- value is mutably borrowed by `b` here
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| value is borrowed by `a` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:76:33
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) => {
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| ^^^^^ --------- value is mutably borrowed by `b` here
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| value is borrowed by `a` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:87:9
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { *b = U; false } => {}
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| ^^^^^ --------- value is mutably borrowed by `b` here
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| |
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| value is borrowed by `a` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:87:33
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { *b = U; false } => {}
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| ^^^^^ --------- value is mutably borrowed by `b` here
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| |
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| value is borrowed by `a` here
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error: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:96:9
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LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { *a = Err(U); false } => {}
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| ^^^^^^^^^ ----- value is borrowed by `b` here
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| |
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| value is mutably borrowed by `a` here
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error: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:96:33
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LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { *a = Err(U); false } => {}
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| ^^^^^^^^^ ----- value is borrowed by `b` here
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| |
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| value is mutably borrowed by `a` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:103:9
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
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| ^^^^^ --------- value is mutably borrowed by `b` here
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| value is borrowed by `a` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:103:33
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
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| ^^^^^ --------- value is mutably borrowed by `b` here
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| value is borrowed by `a` here
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error: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:113:9
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LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { drop(a); false } => {}
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| ^^^^^^^^^ ----- value is borrowed by `b` here
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| value is mutably borrowed by `a` here
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error: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:113:33
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LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { drop(a); false } => {}
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| ^^^^^^^^^ ----- value is borrowed by `b` here
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| |
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| value is mutably borrowed by `a` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:121:9
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LL | let ref a @ (ref mut b, ref mut c) = (U, U);
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| ^^^^^ --------- --------- value is mutably borrowed by `c` here
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| | value is mutably borrowed by `b` here
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| value is borrowed by `a` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:127:9
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LL | let ref a @ (ref mut b, ref mut c) = (U, U);
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| ^^^^^ --------- --------- value is mutably borrowed by `c` here
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| | value is mutably borrowed by `b` here
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| value is borrowed by `a` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:133:9
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LL | let ref a @ (ref mut b, ref mut c) = (U, U);
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| ^^^^^ --------- --------- value is mutably borrowed by `c` here
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| | value is mutably borrowed by `b` here
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| value is borrowed by `a` here
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error: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:138:9
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LL | let ref mut a @ (ref b, ref c) = (U, U);
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| ^^^^^^^^^ ----- ----- value is borrowed by `c` here
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| | value is borrowed by `b` here
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| value is mutably borrowed by `a` here
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error[E0502]: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:8:9
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LL | ref mut z @ &mut Some(ref a) => {
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| ^^^^^^^^^ ----- immutable borrow occurs here
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| mutable borrow occurs here
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...
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LL | println!("{}", *a);
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| -- immutable borrow later used here
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error[E0502]: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:46:9
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LL | let ref mut a @ ref b = u();
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| ^^^^^^^^^ ----- immutable borrow occurs here
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| |
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| mutable borrow occurs here
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...
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LL | drop(b);
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| - immutable borrow later used here
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error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:51:9
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LL | let ref a @ ref mut b = u();
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| ^^^^^ --------- mutable borrow occurs here
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| |
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| immutable borrow occurs here
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...
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LL | *b = u();
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| -------- mutable borrow later used here
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error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:76:9
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) => {
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| ^^^^^ --------- mutable borrow occurs here
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| |
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| immutable borrow occurs here
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...
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LL | *b = U;
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| ------ mutable borrow later used here
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error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:76:33
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) => {
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| ^^^^^ --------- mutable borrow occurs here
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| |
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| immutable borrow occurs here
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...
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LL | *b = U;
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| ------ mutable borrow later used here
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error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:87:9
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { *b = U; false } => {}
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| ^^^^^ --------- mutable borrow occurs here ------ mutable borrow later used here
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| |
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| immutable borrow occurs here
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error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:87:33
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { *b = U; false } => {}
|
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| ^^^^^ --------- ------ mutable borrow later used here
|
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| | |
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| | mutable borrow occurs here
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| immutable borrow occurs here
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error[E0594]: cannot assign to `*b`, as it is immutable for the pattern guard
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:87:61
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { *b = U; false } => {}
|
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| ^^^^^^ cannot assign
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|
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|
= note: variables bound in patterns are immutable until the end of the pattern guard
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error[E0594]: cannot assign to `*a`, as it is immutable for the pattern guard
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:96:61
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LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { *a = Err(U); false } => {}
|
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| ^^^^^^^^^^^ cannot assign
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|
= note: variables bound in patterns are immutable until the end of the pattern guard
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error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:103:9
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
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| ^^^^^ --------- mutable borrow occurs here - mutable borrow later used here
|
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| |
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| immutable borrow occurs here
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error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:103:33
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
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| ^^^^^ --------- - mutable borrow later used here
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| | |
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| | mutable borrow occurs here
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| immutable borrow occurs here
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error[E0507]: cannot move out of `b` in pattern guard
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:103:66
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
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| ^ move occurs because `b` has type `&mut U`, which does not implement the `Copy` trait
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= note: variables bound in patterns cannot be moved from until after the end of the pattern guard
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note: if `U` implemented `Clone`, you could clone the value
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:17:5
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LL | struct U;
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| ^^^^^^^^ consider implementing `Clone` for this type
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...
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
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| - you could clone this value
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error[E0507]: cannot move out of `b` in pattern guard
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:103:66
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LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
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| ^ move occurs because `b` has type `&mut U`, which does not implement the `Copy` trait
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= note: variables bound in patterns cannot be moved from until after the end of the pattern guard
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note: if `U` implemented `Clone`, you could clone the value
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:17:5
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|
|
|
LL | struct U;
|
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| ^^^^^^^^ consider implementing `Clone` for this type
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...
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|
LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
|
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| - you could clone this value
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= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
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error[E0507]: cannot move out of `a` in pattern guard
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:113:66
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|
|
|
|
LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { drop(a); false } => {}
|
|
| ^ move occurs because `a` has type `&mut Result<U, U>`, which does not implement the `Copy` trait
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|
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= note: variables bound in patterns cannot be moved from until after the end of the pattern guard
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error[E0507]: cannot move out of `a` in pattern guard
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:113:66
|
|
|
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|
LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { drop(a); false } => {}
|
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| ^ move occurs because `a` has type `&mut Result<U, U>`, which does not implement the `Copy` trait
|
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|
|
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= note: variables bound in patterns cannot be moved from until after the end of the pattern guard
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= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
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error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
|
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:121:9
|
|
|
|
|
LL | let ref a @ (ref mut b, ref mut c) = (U, U);
|
|
| ^^^^^ --------- mutable borrow occurs here
|
|
| |
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| immutable borrow occurs here
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|
...
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LL | *b = U;
|
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| ------ mutable borrow later used here
|
|
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error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
|
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:127:9
|
|
|
|
|
LL | let ref a @ (ref mut b, ref mut c) = (U, U);
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|
| ^^^^^ --------- mutable borrow occurs here
|
|
| |
|
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| immutable borrow occurs here
|
|
...
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LL | *b = U;
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| ------ mutable borrow later used here
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error[E0502]: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:133:9
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LL | let ref a @ (ref mut b, ref mut c) = (U, U);
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| ^^^^^ --------- mutable borrow occurs here
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| |
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| immutable borrow occurs here
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LL |
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LL | *b = U;
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| ------ mutable borrow later used here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:22:11
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LL | fn f1(ref a @ ref mut b: U) {}
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| ^^^^^ --------- value is mutably borrowed by `b` here
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| |
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| value is borrowed by `a` here
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error: cannot borrow value as immutable because it is also borrowed as mutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:24:11
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LL | fn f2(ref mut a @ ref b: U) {}
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| ^^^^^^^^^ ----- value is borrowed by `b` here
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| |
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| value is mutably borrowed by `a` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:26:11
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LL | fn f3(ref a @ [ref b, ref mut mid @ .., ref c]: [U; 4]) {}
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| ^^^^^ ----------- value is mutably borrowed by `mid` here
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| |
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| value is borrowed by `a` here
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error: cannot borrow value as mutable because it is also borrowed as immutable
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:28:22
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LL | fn f4_also_moved(ref a @ ref mut b @ c: U) {}
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| ^^^^^ --------- - value is moved into `c` here
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| | |
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| | value is mutably borrowed by `b` here
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| value is borrowed by `a` here
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error: cannot move out of value because it is borrowed
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:28:30
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LL | fn f4_also_moved(ref a @ ref mut b @ c: U) {}
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| ^^^^^^^^^ - value is moved into `c` here
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| |
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| value is mutably borrowed by `b` here
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error[E0382]: borrow of moved value
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--> $DIR/borrowck-pat-ref-mut-and-ref.rs:28:30
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LL | fn f4_also_moved(ref a @ ref mut b @ c: U) {}
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| ----- ^^^^^^^^^ - value moved here
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| | |
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| | value borrowed here after move
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| move occurs because value has type `U`, which does not implement the `Copy` trait
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error: aborting due to 51 previous errors
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Some errors have detailed explanations: E0382, E0502, E0507, E0594.
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For more information about an error, try `rustc --explain E0382`.
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