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test more ways of mutably accessing a place

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This commit is contained in:
Ralf Jung 2020-08-30 19:12:36 +02:00
parent 97974e3cab
commit 66b340f500
2 changed files with 45 additions and 1 deletions
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8
src/test/ui/union/union-deref.rs
View File

@ -13,8 +13,16 @@ fn main() {
let mut u : U1<Vec<i32>> = U1 { x: () };
unsafe { (*u.f).0 = Vec::new() }; // explicit deref, this compiles
unsafe { u.f.0 = Vec::new() }; //~ERROR not automatically applying `DerefMut` on `ManuallyDrop` union field
unsafe { &mut (*u.f).0 }; // explicit deref, this compiles
unsafe { &mut u.f.0 }; //~ERROR not automatically applying `DerefMut` on `ManuallyDrop` union field
unsafe { (*u.f).0.push(0) }; // explicit deref, this compiles
unsafe { u.f.0.push(0) }; //~ERROR not automatically applying `DerefMut` on `ManuallyDrop` union field
let mut u : U2<Vec<i32>> = U2 { x: () };
unsafe { (*u.f.0).0 = Vec::new() }; // explicit deref, this compiles
unsafe { u.f.0.0 = Vec::new() }; //~ERROR not automatically applying `DerefMut` on `ManuallyDrop` union field
unsafe { &mut (*u.f.0).0 }; // explicit deref, this compiles
unsafe { &mut u.f.0.0 }; //~ERROR not automatically applying `DerefMut` on `ManuallyDrop` union field
unsafe { (*u.f.0).0.push(0) }; // explicit deref, this compiles
unsafe { u.f.0.0.push(0) }; //~ERROR not automatically applying `DerefMut` on `ManuallyDrop` union field
}

38
src/test/ui/union/union-deref.stderr
View File

@ -7,14 +7,50 @@ LL | unsafe { u.f.0 = Vec::new() };
= help: writing to this reference calls the destructor for the old value
= help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
error: not automatically applying `DerefMut` on `ManuallyDrop` union field
--> $DIR/union-deref.rs:17:19
|
LL | unsafe { &mut u.f.0 };
| ^^^
|
= help: writing to this reference calls the destructor for the old value
= help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
error: not automatically applying `DerefMut` on `ManuallyDrop` union field
--> $DIR/union-deref.rs:19:14
|
LL | unsafe { u.f.0.push(0) };
| ^^^
|
= help: writing to this reference calls the destructor for the old value
= help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
error: not automatically applying `DerefMut` on `ManuallyDrop` union field
--> $DIR/union-deref.rs:23:14
|
LL | unsafe { u.f.0.0 = Vec::new() };
| ^^^^^^^
|
= help: writing to this reference calls the destructor for the old value
= help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
error: aborting due to 2 previous errors
error: not automatically applying `DerefMut` on `ManuallyDrop` union field
--> $DIR/union-deref.rs:25:19
|
LL | unsafe { &mut u.f.0.0 };
| ^^^^^^^
|
= help: writing to this reference calls the destructor for the old value
= help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
error: not automatically applying `DerefMut` on `ManuallyDrop` union field
--> $DIR/union-deref.rs:27:14
|
LL | unsafe { u.f.0.0.push(0) };
| ^^^^^^^
|
= help: writing to this reference calls the destructor for the old value
= help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
error: aborting due to 6 previous errors