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Mention when the type of the moved value doesn't implement Clone

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This commit is contained in:
Esteban Küber 2024-03-17 21:25:38 +00:00
parent d578ac9e47
commit d97d2fe744
33 changed files with 299 additions and 8 deletions
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15
compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
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@ -1195,8 +1195,19 @@ pub(crate) fn suggest_cloning(
let ty = ty.peel_refs();
if self.implements_clone(ty) {
self.suggest_cloning_inner(err, ty, expr);
// } else {
// err.note(format!("if `{ty}` implemented `Clone`, you could clone the value"));
} else if let ty::Adt(def, args) = ty.kind()
&& def.did().as_local().is_some()
&& def.variants().iter().all(|variant| {
variant
.fields
.iter()
.all(|field| self.implements_clone(field.ty(self.infcx.tcx, args)))
})
{
err.span_note(
self.infcx.tcx.def_span(def.did()),
format!("if `{ty}` implemented `Clone`, you could clone the value"),
);
}
}

6
tests/ui/associated-types/issue-25700.stderr
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@ -7,6 +7,12 @@ LL | drop(t);
| - value moved here
LL | drop(t);
| ^ value used here after move
|
note: if `S<()>` implemented `Clone`, you could clone the value
--> $DIR/issue-25700.rs:1:1
|
LL | struct S<T: 'static>(#[allow(dead_code)] Option<&'static T>);
| ^^^^^^^^^^^^^^^^^^^^
error: aborting due to 1 previous error

6
tests/ui/borrowck/borrowck-move-out-of-static-item.stderr
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@ -3,6 +3,12 @@ error[E0507]: cannot move out of static item `BAR`
|
LL | test(BAR);
| ^^^ move occurs because `BAR` has type `Foo`, which does not implement the `Copy` trait
|
note: if `Foo` implemented `Clone`, you could clone the value
--> $DIR/borrowck-move-out-of-static-item.rs:3:1
|
LL | struct Foo {
| ^^^^^^^^^^
error: aborting due to 1 previous error

6
tests/ui/borrowck/borrowck-move-subcomponent.stderr
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@ -9,6 +9,12 @@ LL | let S { x: ax } = a;
| ^^ move out of `a.x` occurs here
LL | f(pb);
| -- borrow later used here
|
note: if `S` implemented `Clone`, you could clone the value
--> $DIR/borrowck-move-subcomponent.rs:6:1
|
LL | struct S {
| ^^^^^^^^
error: aborting due to 1 previous error

6
tests/ui/borrowck/borrowck-overloaded-call.stderr
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@ -29,6 +29,12 @@ LL | s(" world".to_string());
| - value moved here
LL | s(" world".to_string());
| ^ value used here after move
|
note: if `SFnOnce` implemented `Clone`, you could clone the value
--> $DIR/borrowck-overloaded-call.rs:41:1
|
LL | struct SFnOnce {
| ^^^^^^^^^^^^^^
error: aborting due to 3 previous errors

5
tests/ui/borrowck/clone-on-ref.stderr
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@ -52,6 +52,11 @@ LL |
LL | println!("{b:?}");
| ----- borrow later used here
|
note: if `A` implemented `Clone`, you could clone the value
--> $DIR/clone-on-ref.rs:19:1
|
LL | struct A;
| ^^^^^^^^
help: consider annotating `A` with `#[derive(Clone)]`
|
LL + #[derive(Clone)]

6
tests/ui/borrowck/issue-103624.stderr
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@ -9,6 +9,12 @@ LL | spawn_blocking(move || {
LL |
LL | self.b;
| ^^^^^^ move occurs because `self.b` has type `StructB`, which does not implement the `Copy` trait
|
note: if `StructB` implemented `Clone`, you could clone the value
--> $DIR/issue-103624.rs:23:1
|
LL | struct StructB {}
| ^^^^^^^^^^^^^^
error[E0521]: borrowed data escapes outside of method
--> $DIR/issue-103624.rs:14:9

5
tests/ui/borrowck/issue-119915-bad-clone-suggestion.stderr
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@ -11,6 +11,11 @@ note: `Example::<E, FakeParam>::change` takes ownership of the receiver `self`,
|
LL | unsafe fn change<NewFakeParam>(self) -> Example<E, NewFakeParam> {
| ^^^^
note: if `Example<E, NoLifetime>` implemented `Clone`, you could clone the value
--> $DIR/issue-119915-bad-clone-suggestion.rs:3:1
|
LL | struct Example<E, FakeParam>(PhantomData<(fn(E), fn(FakeParam))>);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 1 previous error

5
tests/ui/borrowck/issue-17718-static-move.stderr
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@ -4,6 +4,11 @@ error[E0507]: cannot move out of static item `FOO`
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;
| ^^^^^^^^^^
help: consider borrowing here
|
LL | let _a = &FOO;

20
tests/ui/borrowck/issue-20801.stderr
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@ -19,6 +19,11 @@ error[E0507]: cannot move out of a mutable reference
LL | let a = unsafe { *mut_ref() };
| ^^^^^^^^^^ move occurs because value has type `T`, which does not implement the `Copy` trait
|
note: if `T` implemented `Clone`, you could clone the value
--> $DIR/issue-20801.rs:3:1
|
LL | struct T(u8);
| ^^^^^^^^
help: consider removing the dereference here
|
LL - let a = unsafe { *mut_ref() };
@ -31,6 +36,11 @@ error[E0507]: cannot move out of a shared reference
LL | let b = unsafe { *imm_ref() };
| ^^^^^^^^^^ move occurs because value has type `T`, which does not implement the `Copy` trait
|
note: if `T` implemented `Clone`, you could clone the value
--> $DIR/issue-20801.rs:3:1
|
LL | struct T(u8);
| ^^^^^^^^
help: consider removing the dereference here
|
LL - let b = unsafe { *imm_ref() };
@ -43,6 +53,11 @@ error[E0507]: cannot move out of a raw pointer
LL | let c = unsafe { *mut_ptr() };
| ^^^^^^^^^^ move occurs because value has type `T`, which does not implement the `Copy` trait
|
note: if `T` implemented `Clone`, you could clone the value
--> $DIR/issue-20801.rs:3:1
|
LL | struct T(u8);
| ^^^^^^^^
help: consider removing the dereference here
|
LL - let c = unsafe { *mut_ptr() };
@ -55,6 +70,11 @@ error[E0507]: cannot move out of a raw pointer
LL | let d = unsafe { *const_ptr() };
| ^^^^^^^^^^^^ move occurs because value has type `T`, which does not implement the `Copy` trait
|
note: if `T` implemented `Clone`, you could clone the value
--> $DIR/issue-20801.rs:3:1
|
LL | struct T(u8);
| ^^^^^^^^
help: consider removing the dereference here
|
LL - let d = unsafe { *const_ptr() };

6
tests/ui/borrowck/move-error-in-promoted-2.stderr
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@ -6,6 +6,12 @@ LL | &([S][0],);
| |
| cannot move out of here
| move occurs because value has type `S`, which does not implement the `Copy` trait
|
note: if `S` implemented `Clone`, you could clone the value
--> $DIR/move-error-in-promoted-2.rs:3:1
|
LL | struct S;
| ^^^^^^^^
error: aborting due to 1 previous error

5
tests/ui/borrowck/move-error-snippets.stderr
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@ -9,6 +9,11 @@ LL | let a = $c;
LL | sss!();
| ------ in this macro invocation
|
note: if `A` implemented `Clone`, you could clone the value
--> $DIR/move-error-snippets.rs:9:1
|
LL | struct A;
| ^^^^^^^^
= note: this error originates in the macro `aaa` which comes from the expansion of the macro `sss` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider borrowing here
|

12
tests/ui/borrowck/move-in-static-initializer-issue-38520.stderr
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@ -3,12 +3,24 @@ error[E0507]: cannot move out of a shared reference
|
LL | static Y: usize = get(*&X);
| ^^^ move occurs because value has type `Foo`, which does not implement the `Copy` trait
|
note: if `Foo` implemented `Clone`, you could clone the value
--> $DIR/move-in-static-initializer-issue-38520.rs:5:1
|
LL | struct Foo(usize);
| ^^^^^^^^^^
error[E0507]: cannot move out of a shared reference
--> $DIR/move-in-static-initializer-issue-38520.rs:13:22
|
LL | const Z: usize = get(*&X);
| ^^^ move occurs because value has type `Foo`, which does not implement the `Copy` trait
|
note: if `Foo` implemented `Clone`, you could clone the value
--> $DIR/move-in-static-initializer-issue-38520.rs:5:1
|
LL | struct Foo(usize);
| ^^^^^^^^^^
error: aborting due to 2 previous errors

6
tests/ui/box/leak-alloc.stderr
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@ -11,6 +11,12 @@ LL | drop(alloc);
LL |
LL | use_value(*theref)
| ------- borrow later used here
|
note: if `Alloc` implemented `Clone`, you could clone the value
--> $DIR/leak-alloc.rs:8:1
|
LL | struct Alloc {}
| ^^^^^^^^^^^^
error: aborting due to 1 previous error

5
tests/ui/derives/deriving-with-repr-packed.stderr
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@ -36,6 +36,11 @@ LL | #[repr(packed)]
LL | struct X(Y);
| ^ move occurs because `self.0` has type `Y`, which does not implement the `Copy` trait
|
note: if `Y` implemented `Clone`, you could clone the value
--> $DIR/deriving-with-repr-packed.rs:16:1
|
LL | struct Y(usize);
| ^^^^^^^^
= note: `#[derive(Debug)]` triggers a move because taking references to the fields of a packed struct is undefined behaviour
= note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

6
tests/ui/error-codes/E0504.stderr
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@ -13,6 +13,12 @@ LL | println!("child function: {}", fancy_num.num);
...
LL | println!("main function: {}", fancy_ref.num);
| ------------- borrow later used here
|
note: if `FancyNum` implemented `Clone`, you could clone the value
--> $DIR/E0504.rs:1:1
|
LL | struct FancyNum {
| ^^^^^^^^^^^^^^^
error: aborting due to 1 previous error

6
tests/ui/error-codes/E0505.stderr
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@ -10,6 +10,12 @@ LL | eat(x);
| ^ move out of `x` occurs here
LL | _ref_to_val.use_ref();
| ----------- borrow later used here
|
note: if `Value` implemented `Clone`, you could clone the value
--> $DIR/E0505.rs:1:1
|
LL | struct Value {}
| ^^^^^^^^^^^^
error: aborting due to 1 previous error

5
tests/ui/error-codes/E0507.stderr
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@ -11,6 +11,11 @@ note: `TheDarkKnight::nothing_is_true` takes ownership of the receiver `self`, w
|
LL | fn nothing_is_true(self) {}
| ^^^^
note: if `TheDarkKnight` implemented `Clone`, you could clone the value
--> $DIR/E0507.rs:3:1
|
LL | struct TheDarkKnight;
| ^^^^^^^^^^^^^^^^^^^^
error: aborting due to 1 previous error

5
tests/ui/error-codes/E0508-fail.stderr
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@ -7,6 +7,11 @@ LL | let _value = array[0];
| cannot move out of here
| move occurs because `array[_]` has type `NonCopy`, which does not implement the `Copy` trait
|
note: if `NonCopy` implemented `Clone`, you could clone the value
--> $DIR/E0508-fail.rs:1:1
|
LL | struct NonCopy;
| ^^^^^^^^^^^^^^
help: consider borrowing here
|
LL | let _value = &array[0];

5
tests/ui/error-codes/E0508.stderr
View File

@ -7,6 +7,11 @@ LL | let _value = array[0];
| cannot move out of here
| move occurs because `array[_]` has type `NonCopy`, which does not implement the `Copy` trait
|
note: if `NonCopy` implemented `Clone`, you could clone the value
--> $DIR/E0508.rs:1:1
|
LL | struct NonCopy;
| ^^^^^^^^^^^^^^
help: consider borrowing here
|
LL | let _value = &array[0];

5
tests/ui/error-codes/E0509.stderr
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@ -7,6 +7,11 @@ LL | let fancy_field = drop_struct.fancy;
| cannot move out of here
| move occurs because `drop_struct.fancy` has type `FancyNum`, which does not implement the `Copy` trait
|
note: if `FancyNum` implemented `Clone`, you could clone the value
--> $DIR/E0509.rs:1:1
|
LL | struct FancyNum {
| ^^^^^^^^^^^^^^^
help: consider borrowing here
|
LL | let fancy_field = &drop_struct.fancy;

12
tests/ui/issues/issue-17385.stderr
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@ -7,6 +7,12 @@ LL | drop(foo);
| --- value moved here
LL | match foo {
| ^^^^^^^^^ value used here after move
|
note: if `X` implemented `Clone`, you could clone the value
--> $DIR/issue-17385.rs:1:1
|
LL | struct X(isize);
| ^^^^^^^^
error[E0382]: use of moved value: `e`
--> $DIR/issue-17385.rs:25:11
@ -17,6 +23,12 @@ LL | drop(e);
| - value moved here
LL | match e {
| ^ value used here after move
|
note: if `Enum` implemented `Clone`, you could clone the value
--> $DIR/issue-17385.rs:3:1
|
LL | enum Enum {
| ^^^^^^^^^
error: aborting due to 2 previous errors

6
tests/ui/mir/issue-102389.stderr
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@ -3,6 +3,12 @@ error[E0507]: cannot move out of `*inbounds` which is behind a shared reference
|
LL | array[*inbounds as usize]
| ^^^^^^^^^ move occurs because `*inbounds` has type `Enum`, which does not implement the `Copy` trait
|
note: if `Enum` implemented `Clone`, you could clone the value
--> $DIR/issue-102389.rs:1:1
|
LL | enum Enum { A, B, C }
| ^^^^^^^^^
error: aborting due to 1 previous error

4
tests/ui/moves/issue-72649-uninit-in-loop.rs
View File

@ -3,6 +3,10 @@
// 'value moved in previous iteration of loop' message
struct NonCopy;
//~^ NOTE if `NonCopy` implemented `Clone`
//~| NOTE if `NonCopy` implemented `Clone`
//~| NOTE if `NonCopy` implemented `Clone`
//~| NOTE if `NonCopy` implemented `Clone`
fn good() {
loop {

36
tests/ui/moves/issue-72649-uninit-in-loop.stderr
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@ -1,5 +1,5 @@
error[E0382]: use of moved value: `value`
--> $DIR/issue-72649-uninit-in-loop.rs:20:22
--> $DIR/issue-72649-uninit-in-loop.rs:24:22
|
LL | let value = NonCopy{};
| ----- move occurs because `value` has type `NonCopy`, which does not implement the `Copy` trait
@ -9,9 +9,15 @@ LL | let _used = value;
LL |
LL | let _used2 = value;
| ^^^^^ value used here after move
|
note: if `NonCopy` implemented `Clone`, you could clone the value
--> $DIR/issue-72649-uninit-in-loop.rs:5:1
|
LL | struct NonCopy;
| ^^^^^^^^^^^^^^
error[E0382]: use of moved value: `value`
--> $DIR/issue-72649-uninit-in-loop.rs:32:26
--> $DIR/issue-72649-uninit-in-loop.rs:36:26
|
LL | let value = NonCopy{};
| ----- move occurs because `value` has type `NonCopy`, which does not implement the `Copy` trait
@ -23,9 +29,15 @@ LL | let _used = value;
...
LL | let _used2 = value;
| ^^^^^ value used here after move
|
note: if `NonCopy` implemented `Clone`, you could clone the value
--> $DIR/issue-72649-uninit-in-loop.rs:5:1
|
LL | struct NonCopy;
| ^^^^^^^^^^^^^^
error[E0382]: use of moved value: `value`
--> $DIR/issue-72649-uninit-in-loop.rs:42:21
--> $DIR/issue-72649-uninit-in-loop.rs:46:21
|
LL | let value = NonCopy{};
| ----- move occurs because `value` has type `NonCopy`, which does not implement the `Copy` trait
@ -34,9 +46,15 @@ LL | loop {
| ---- inside of this loop
LL | let _used = value;
| ^^^^^ value moved here, in previous iteration of loop
|
note: if `NonCopy` implemented `Clone`, you could clone the value
--> $DIR/issue-72649-uninit-in-loop.rs:5:1
|
LL | struct NonCopy;
| ^^^^^^^^^^^^^^
error[E0382]: use of moved value: `value`
--> $DIR/issue-72649-uninit-in-loop.rs:53:22
--> $DIR/issue-72649-uninit-in-loop.rs:57:22
|
LL | let mut value = NonCopy{};
| --------- move occurs because `value` has type `NonCopy`, which does not implement the `Copy` trait
@ -45,9 +63,15 @@ LL | loop {
| ---- inside of this loop
LL | let _used2 = value;
| ^^^^^ value moved here, in previous iteration of loop
|
note: if `NonCopy` implemented `Clone`, you could clone the value
--> $DIR/issue-72649-uninit-in-loop.rs:5:1
|
LL | struct NonCopy;
| ^^^^^^^^^^^^^^
error[E0381]: used binding `value` isn't initialized
--> $DIR/issue-72649-uninit-in-loop.rs:61:21
--> $DIR/issue-72649-uninit-in-loop.rs:65:21
|
LL | let value: NonCopy;
| ----- binding declared here but left uninitialized
@ -60,7 +84,7 @@ LL | let value: NonCopy = todo!();
| +++++++++
error[E0381]: used binding `value` isn't initialized
--> $DIR/issue-72649-uninit-in-loop.rs:69:21
--> $DIR/issue-72649-uninit-in-loop.rs:73:21
|
LL | let mut value: NonCopy;
| --------- binding declared here but left uninitialized

11
tests/ui/moves/move-fn-self-receiver.stderr
View File

@ -101,6 +101,12 @@ LL | mut_foo;
| ^^^^^^^ move out of `mut_foo` occurs here
LL | ret;
| --- borrow later used here
|
note: if `Foo` implemented `Clone`, you could clone the value
--> $DIR/move-fn-self-receiver.rs:5:1
|
LL | struct Foo;
| ^^^^^^^^^^
error[E0382]: use of moved value: `rc_foo`
--> $DIR/move-fn-self-receiver.rs:55:5
@ -132,6 +138,11 @@ LL | foo_add + Foo;
LL | foo_add;
| ^^^^^^^ value used here after move
|
note: if `Foo` implemented `Clone`, you could clone the value
--> $DIR/move-fn-self-receiver.rs:5:1
|
LL | struct Foo;
| ^^^^^^^^^^
note: calling this operator moves the left-hand side
--> $SRC_DIR/core/src/ops/arith.rs:LL:COL

6
tests/ui/moves/move-out-of-array-1.stderr
View File

@ -6,6 +6,12 @@ LL | a[i]
| |
| cannot move out of here
| move occurs because `a[_]` has type `D`, which does not implement the `Copy` trait
|
note: if `D` implemented `Clone`, you could clone the value
--> $DIR/move-out-of-array-1.rs:5:1
|
LL | struct D { _x: u8 }
| ^^^^^^^^
error: aborting due to 1 previous error

12
tests/ui/nll/issue-21232-partial-init-and-use.stderr
View File

@ -27,6 +27,12 @@ LL | let mut s: S<B> = S::new(); drop(s);
| move occurs because `s` has type `S<Box<u32>>`, which does not implement the `Copy` trait
LL | s.x = 10; s.y = Box::new(20);
| ^^^^^^^^ value partially assigned here after move
|
note: if `S<Box<u32>>` implemented `Clone`, you could clone the value
--> $DIR/issue-21232-partial-init-and-use.rs:15:1
|
LL | struct S<Y> {
| ^^^^^^^^^^^
error[E0382]: assign to part of moved value: `t`
--> $DIR/issue-21232-partial-init-and-use.rs:116:5
@ -72,6 +78,12 @@ LL | let mut s: S<B> = S::new(); drop(s);
| move occurs because `s` has type `S<Box<u32>>`, which does not implement the `Copy` trait
LL | s.x = 10;
| ^^^^^^^^ value partially assigned here after move
|
note: if `S<Box<u32>>` implemented `Clone`, you could clone the value
--> $DIR/issue-21232-partial-init-and-use.rs:15:1
|
LL | struct S<Y> {
| ^^^^^^^^^^^
error[E0382]: assign to part of moved value: `t`
--> $DIR/issue-21232-partial-init-and-use.rs:142:5

31
tests/ui/nll/move-errors.stderr
View File

@ -4,6 +4,11 @@ error[E0507]: cannot move out of `*a` which is behind a shared reference
LL | let b = *a;
| ^^ move occurs because `*a` has type `A`, which does not implement the `Copy` trait
|
note: if `A` implemented `Clone`, you could clone the value
--> $DIR/move-errors.rs:1:1
|
LL | struct A(String);
| ^^^^^^^^
help: consider removing the dereference here
|
LL - let b = *a;
@ -19,6 +24,11 @@ LL | let b = a[0];
| cannot move out of here
| move occurs because `a[_]` has type `A`, which does not implement the `Copy` trait
|
note: if `A` implemented `Clone`, you could clone the value
--> $DIR/move-errors.rs:1:1
|
LL | struct A(String);
| ^^^^^^^^
help: consider borrowing here
|
LL | let b = &a[0];
@ -30,6 +40,11 @@ error[E0507]: cannot move out of `**r` which is behind a shared reference
LL | let s = **r;
| ^^^ move occurs because `**r` has type `A`, which does not implement the `Copy` trait
|
note: if `A` implemented `Clone`, you could clone the value
--> $DIR/move-errors.rs:1:1
|
LL | struct A(String);
| ^^^^^^^^
help: consider removing the dereference here
|
LL - let s = **r;
@ -42,6 +57,11 @@ error[E0507]: cannot move out of an `Rc`
LL | let s = *r;
| ^^ move occurs because value has type `A`, which does not implement the `Copy` trait
|
note: if `A` implemented `Clone`, you could clone the value
--> $DIR/move-errors.rs:1:1
|
LL | struct A(String);
| ^^^^^^^^
help: consider removing the dereference here
|
LL - let s = *r;
@ -57,6 +77,11 @@ LL | let a = [A("".to_string())][0];
| cannot move out of here
| move occurs because value has type `A`, which does not implement the `Copy` trait
|
note: if `A` implemented `Clone`, you could clone the value
--> $DIR/move-errors.rs:1:1
|
LL | struct A(String);
| ^^^^^^^^
help: consider borrowing here
|
LL | let a = &[A("".to_string())][0];
@ -96,6 +121,12 @@ error[E0507]: cannot move out of `*a` which is behind a shared reference
|
LL | b = *a;
| ^^ move occurs because `*a` has type `A`, which does not implement the `Copy` trait
|
note: if `A` implemented `Clone`, you could clone the value
--> $DIR/move-errors.rs:1:1
|
LL | struct A(String);
| ^^^^^^^^
error[E0508]: cannot move out of type `[B; 1]`, a non-copy array
--> $DIR/move-errors.rs:74:11

10
tests/ui/pattern/bindings-after-at/borrowck-pat-ref-mut-and-ref.stderr
View File

@ -333,6 +333,11 @@ LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false
| ^ move occurs because `b` has type `&mut U`, which does not implement the `Copy` trait
|
= note: variables bound in patterns cannot be moved from until after the end of the pattern guard
note: if `U` implemented `Clone`, you could clone the value
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:17:5
|
LL | struct U;
| ^^^^^^^^
error[E0507]: cannot move out of `b` in pattern guard
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:103:66
@ -341,6 +346,11 @@ LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false
| ^ move occurs because `b` has type `&mut U`, which does not implement the `Copy` trait
|
= note: variables bound in patterns cannot be moved from until after the end of the pattern guard
note: if `U` implemented `Clone`, you could clone the value
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:17:5
|
LL | struct U;
| ^^^^^^^^
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
error[E0507]: cannot move out of `a` in pattern guard

5
tests/ui/union/union-borrow-move-parent-sibling.stderr
View File

@ -50,6 +50,11 @@ error[E0507]: cannot move out of dereference of `ManuallyDrop<((MockVec<u8>, Moc
LL | let a = (u.x.0).0;
| ^^^^^^^^^ move occurs because value has type `MockVec<u8>`, which does not implement the `Copy` trait
|
note: if `MockVec<u8>` implemented `Clone`, you could clone the value
--> $DIR/union-borrow-move-parent-sibling.rs:25:1
|
LL | struct MockVec<T> {
| ^^^^^^^^^^^^^^^^^
help: consider borrowing here
|
LL | let a = &(u.x.0).0;

10
tests/ui/union/union-move.stderr
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@ -16,6 +16,11 @@ LL | fn move_out<T>(x: T) {}
| -------- ^ this parameter takes ownership of the value
| |
| in this function
note: if `U1` implemented `Clone`, you could clone the value
--> $DIR/union-move.rs:9:1
|
LL | union U1 {
| ^^^^^^^^
error[E0382]: use of moved value: `x`
--> $DIR/union-move.rs:42:18
@ -35,6 +40,11 @@ LL | fn move_out<T>(x: T) {}
| -------- ^ this parameter takes ownership of the value
| |
| in this function
note: if `U1` implemented `Clone`, you could clone the value
--> $DIR/union-move.rs:9:1
|
LL | union U1 {
| ^^^^^^^^
error[E0509]: cannot move out of type `U2`, which implements the `Drop` trait
--> $DIR/union-move.rs:49:18

18
tests/ui/variance/variance-issue-20533.stderr
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@ -9,6 +9,12 @@ LL | drop(a);
| ^ move out of `a` occurs here
LL | drop(x);
| - borrow later used here
|
note: if `AffineU32` implemented `Clone`, you could clone the value
--> $DIR/variance-issue-20533.rs:26:1
|
LL | struct AffineU32(u32);
| ^^^^^^^^^^^^^^^^
error[E0505]: cannot move out of `a` because it is borrowed
--> $DIR/variance-issue-20533.rs:41:14
@ -21,6 +27,12 @@ LL | drop(a);
| ^ move out of `a` occurs here
LL | drop(x);
| - borrow later used here
|
note: if `AffineU32` implemented `Clone`, you could clone the value
--> $DIR/variance-issue-20533.rs:26:1
|
LL | struct AffineU32(u32);
| ^^^^^^^^^^^^^^^^
error[E0505]: cannot move out of `a` because it is borrowed
--> $DIR/variance-issue-20533.rs:47:14
@ -33,6 +45,12 @@ LL | drop(a);
| ^ move out of `a` occurs here
LL | drop(x);
| - borrow later used here
|
note: if `AffineU32` implemented `Clone`, you could clone the value
--> $DIR/variance-issue-20533.rs:26:1
|
LL | struct AffineU32(u32);
| ^^^^^^^^^^^^^^^^
error[E0505]: cannot move out of `a` because it is borrowed
--> $DIR/variance-issue-20533.rs:53:14