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rust/tests/ui/moves/nested-loop-moved-value-wrong-continue.stderr

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Detect when move of `!Copy` value occurs within `loop` and should likely not be cloned When encountering a move error on a value within a loop of any kind, identify if the moved value belongs to a call expression that should not be cloned and avoid the semantically incorrect suggestion. Also try to suggest moving the call expression outside of the loop instead. ``` error[E0382]: use of moved value: `vec` --> $DIR/recreating-value-in-loop-condition.rs:6:33 | LL | let vec = vec!["one", "two", "three"]; | --- move occurs because `vec` has type `Vec<&str>`, which does not implement the `Copy` trait LL | while let Some(item) = iter(vec).next() { | ----------------------------^^^-------- | | | | | value moved here, in previous iteration of loop | inside of this loop | note: consider changing this parameter type in function `iter` to borrow instead if owning the value isn't necessary --> $DIR/recreating-value-in-loop-condition.rs:1:17 | LL | fn iter<T>(vec: Vec<T>) -> impl Iterator<Item = T> { | ---- ^^^^^^ this parameter takes ownership of the value | | | in this function help: consider moving the expression out of the loop so it is only moved once | LL ~ let mut value = iter(vec); LL ~ while let Some(item) = value.next() { | ``` We use the presence of a `break` in the loop that would be affected by the moved value as a heuristic for "shouldn't be cloned". Fix #121466.
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error[E0382]: use of moved value: `foo`
Point at `continue` and `break` that might be in the wrong place Sometimes move errors are because of a misplaced `continue`, but we didn't surface that anywhere. Now when there are more than one set of nested loops we show them out and point at the `continue` and `break` expressions within that might need to go elsewhere. ``` error[E0382]: use of moved value: `foo` --> $DIR/nested-loop-moved-value-wrong-continue.rs:46:18 | LL | for foo in foos { | --- | | | this reinitialization might get skipped | move occurs because `foo` has type `String`, which does not implement the `Copy` trait ... LL | for bar in &bars { | ---------------- inside of this loop ... LL | baz.push(foo); | --- value moved here, in previous iteration of loop ... LL | qux.push(foo); | ^^^ value used here after move | note: verify that your loop breaking logic is correct --> $DIR/nested-loop-moved-value-wrong-continue.rs:41:17 | LL | for foo in foos { | --------------- ... LL | for bar in &bars { | ---------------- ... LL | continue; | ^^^^^^^^ this `continue` advances the loop at line 33 help: consider moving the expression out of the loop so it is only moved once | LL ~ let mut value = baz.push(foo); LL ~ for bar in &bars { LL | ... LL | if foo == *bar { LL ~ value; | help: consider cloning the value if the performance cost is acceptable | LL | baz.push(foo.clone()); | ++++++++ ``` Fix #92531.
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--> $DIR/nested-loop-moved-value-wrong-continue.rs:19:14
|
LL | for foo in foos { for bar in &bars { if foo == *bar {
| --- ---------------- inside of this loop
| |
| this reinitialization might get skipped
| move occurs because `foo` has type `String`, which does not implement the `Copy` trait
...
LL | baz.push(foo);
| --- value moved here, in previous iteration of loop
...
LL | qux.push(foo);
| ^^^ value used here after move
|
note: verify that your loop breaking logic is correct
--> $DIR/nested-loop-moved-value-wrong-continue.rs:15:9
|
LL | for foo in foos { for bar in &bars { if foo == *bar {
| --------------- ----------------
...
LL | continue;
| ^^^^^^^^ this `continue` advances the loop at $DIR/nested-loop-moved-value-wrong-continue.rs:6:23: 18:8
help: consider moving the expression out of the loop so it is only moved once
|
LL ~ for foo in foos { let mut value = baz.push(foo);
LL ~ for bar in &bars { if foo == *bar {
LL |
...
LL |
LL ~ value;
|
help: consider cloning the value if the performance cost is acceptable
|
LL | baz.push(foo.clone());
| ++++++++
error[E0382]: use of moved value: `foo`
--> $DIR/nested-loop-moved-value-wrong-continue.rs:46:18
Detect when move of `!Copy` value occurs within `loop` and should likely not be cloned When encountering a move error on a value within a loop of any kind, identify if the moved value belongs to a call expression that should not be cloned and avoid the semantically incorrect suggestion. Also try to suggest moving the call expression outside of the loop instead. ``` error[E0382]: use of moved value: `vec` --> $DIR/recreating-value-in-loop-condition.rs:6:33 | LL | let vec = vec!["one", "two", "three"]; | --- move occurs because `vec` has type `Vec<&str>`, which does not implement the `Copy` trait LL | while let Some(item) = iter(vec).next() { | ----------------------------^^^-------- | | | | | value moved here, in previous iteration of loop | inside of this loop | note: consider changing this parameter type in function `iter` to borrow instead if owning the value isn't necessary --> $DIR/recreating-value-in-loop-condition.rs:1:17 | LL | fn iter<T>(vec: Vec<T>) -> impl Iterator<Item = T> { | ---- ^^^^^^ this parameter takes ownership of the value | | | in this function help: consider moving the expression out of the loop so it is only moved once | LL ~ let mut value = iter(vec); LL ~ while let Some(item) = value.next() { | ``` We use the presence of a `break` in the loop that would be affected by the moved value as a heuristic for "shouldn't be cloned". Fix #121466.
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|
LL | for foo in foos {
| ---
| |
| this reinitialization might get skipped
| move occurs because `foo` has type `String`, which does not implement the `Copy` trait
...
LL | for bar in &bars {
| ---------------- inside of this loop
...
LL | baz.push(foo);
| --- value moved here, in previous iteration of loop
...
LL | qux.push(foo);
| ^^^ value used here after move
|
Point at `continue` and `break` that might be in the wrong place Sometimes move errors are because of a misplaced `continue`, but we didn't surface that anywhere. Now when there are more than one set of nested loops we show them out and point at the `continue` and `break` expressions within that might need to go elsewhere. ``` error[E0382]: use of moved value: `foo` --> $DIR/nested-loop-moved-value-wrong-continue.rs:46:18 | LL | for foo in foos { | --- | | | this reinitialization might get skipped | move occurs because `foo` has type `String`, which does not implement the `Copy` trait ... LL | for bar in &bars { | ---------------- inside of this loop ... LL | baz.push(foo); | --- value moved here, in previous iteration of loop ... LL | qux.push(foo); | ^^^ value used here after move | note: verify that your loop breaking logic is correct --> $DIR/nested-loop-moved-value-wrong-continue.rs:41:17 | LL | for foo in foos { | --------------- ... LL | for bar in &bars { | ---------------- ... LL | continue; | ^^^^^^^^ this `continue` advances the loop at line 33 help: consider moving the expression out of the loop so it is only moved once | LL ~ let mut value = baz.push(foo); LL ~ for bar in &bars { LL | ... LL | if foo == *bar { LL ~ value; | help: consider cloning the value if the performance cost is acceptable | LL | baz.push(foo.clone()); | ++++++++ ``` Fix #92531.
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note: verify that your loop breaking logic is correct
--> $DIR/nested-loop-moved-value-wrong-continue.rs:41:17
|
LL | for foo in foos {
| ---------------
...
LL | for bar in &bars {
| ----------------
...
LL | continue;
| ^^^^^^^^ this `continue` advances the loop at line 33
Detect when move of `!Copy` value occurs within `loop` and should likely not be cloned When encountering a move error on a value within a loop of any kind, identify if the moved value belongs to a call expression that should not be cloned and avoid the semantically incorrect suggestion. Also try to suggest moving the call expression outside of the loop instead. ``` error[E0382]: use of moved value: `vec` --> $DIR/recreating-value-in-loop-condition.rs:6:33 | LL | let vec = vec!["one", "two", "three"]; | --- move occurs because `vec` has type `Vec<&str>`, which does not implement the `Copy` trait LL | while let Some(item) = iter(vec).next() { | ----------------------------^^^-------- | | | | | value moved here, in previous iteration of loop | inside of this loop | note: consider changing this parameter type in function `iter` to borrow instead if owning the value isn't necessary --> $DIR/recreating-value-in-loop-condition.rs:1:17 | LL | fn iter<T>(vec: Vec<T>) -> impl Iterator<Item = T> { | ---- ^^^^^^ this parameter takes ownership of the value | | | in this function help: consider moving the expression out of the loop so it is only moved once | LL ~ let mut value = iter(vec); LL ~ while let Some(item) = value.next() { | ``` We use the presence of a `break` in the loop that would be affected by the moved value as a heuristic for "shouldn't be cloned". Fix #121466.
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help: consider moving the expression out of the loop so it is only moved once
|
LL ~ let mut value = baz.push(foo);
LL ~ for bar in &bars {
LL |
...
LL | if foo == *bar {
LL ~ value;
|
help: consider cloning the value if the performance cost is acceptable
|
LL | baz.push(foo.clone());
| ++++++++
Point at `continue` and `break` that might be in the wrong place Sometimes move errors are because of a misplaced `continue`, but we didn't surface that anywhere. Now when there are more than one set of nested loops we show them out and point at the `continue` and `break` expressions within that might need to go elsewhere. ``` error[E0382]: use of moved value: `foo` --> $DIR/nested-loop-moved-value-wrong-continue.rs:46:18 | LL | for foo in foos { | --- | | | this reinitialization might get skipped | move occurs because `foo` has type `String`, which does not implement the `Copy` trait ... LL | for bar in &bars { | ---------------- inside of this loop ... LL | baz.push(foo); | --- value moved here, in previous iteration of loop ... LL | qux.push(foo); | ^^^ value used here after move | note: verify that your loop breaking logic is correct --> $DIR/nested-loop-moved-value-wrong-continue.rs:41:17 | LL | for foo in foos { | --------------- ... LL | for bar in &bars { | ---------------- ... LL | continue; | ^^^^^^^^ this `continue` advances the loop at line 33 help: consider moving the expression out of the loop so it is only moved once | LL ~ let mut value = baz.push(foo); LL ~ for bar in &bars { LL | ... LL | if foo == *bar { LL ~ value; | help: consider cloning the value if the performance cost is acceptable | LL | baz.push(foo.clone()); | ++++++++ ``` Fix #92531.
2024-02-26 16:54:34 -06:00
error: aborting due to 2 previous errors
Detect when move of `!Copy` value occurs within `loop` and should likely not be cloned When encountering a move error on a value within a loop of any kind, identify if the moved value belongs to a call expression that should not be cloned and avoid the semantically incorrect suggestion. Also try to suggest moving the call expression outside of the loop instead. ``` error[E0382]: use of moved value: `vec` --> $DIR/recreating-value-in-loop-condition.rs:6:33 | LL | let vec = vec!["one", "two", "three"]; | --- move occurs because `vec` has type `Vec<&str>`, which does not implement the `Copy` trait LL | while let Some(item) = iter(vec).next() { | ----------------------------^^^-------- | | | | | value moved here, in previous iteration of loop | inside of this loop | note: consider changing this parameter type in function `iter` to borrow instead if owning the value isn't necessary --> $DIR/recreating-value-in-loop-condition.rs:1:17 | LL | fn iter<T>(vec: Vec<T>) -> impl Iterator<Item = T> { | ---- ^^^^^^ this parameter takes ownership of the value | | | in this function help: consider moving the expression out of the loop so it is only moved once | LL ~ let mut value = iter(vec); LL ~ while let Some(item) = value.next() { | ``` We use the presence of a `break` in the loop that would be affected by the moved value as a heuristic for "shouldn't be cloned". Fix #121466.
2024-02-26 14:06:19 -06:00
For more information about this error, try `rustc --explain E0382`.
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