1 // revisions: mirunsafeck thirunsafeck
2 // [thirunsafeck]compile-flags: -Z thir-unsafeck
4 use std::ops::AddAssign;
5 use std::mem::ManuallyDrop;
8 impl AddAssign for NonCopy {
9 fn add_assign(&mut self, _: Self) {}
13 a: u8, // non-dropping
14 b: ManuallyDrop<NonCopy>,
18 let mut foo = Foo { a: 42 };
19 foo.a += 5; //~ ERROR access to union field is unsafe
20 *foo.b += NonCopy; //~ ERROR access to union field is unsafe
21 *foo.b = NonCopy; //~ ERROR access to union field is unsafe
22 foo.b = ManuallyDrop::new(NonCopy);
23 foo.a; //~ ERROR access to union field is unsafe
24 let foo = Foo { a: 42 };
25 foo.b; //~ ERROR access to union field is unsafe
26 let mut foo = Foo { a: 42 };
28 //~^ ERROR access to union field is unsafe