mirror of https://github.com/rust-lang/rust
27 lines
723 B
Rust
27 lines
723 B
Rust
use std::ops::AddAssign;
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use std::mem::ManuallyDrop;
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struct NonCopy;
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impl AddAssign for NonCopy {
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fn add_assign(&mut self, _: Self) {}
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}
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union Foo {
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a: u8, // non-dropping
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b: ManuallyDrop<NonCopy>,
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}
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fn main() {
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let mut foo = Foo { a: 42 };
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foo.a += 5; //~ ERROR access to union field is unsafe
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*foo.b += NonCopy; //~ ERROR access to union field is unsafe
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*foo.b = NonCopy; //~ ERROR access to union field is unsafe
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foo.b = ManuallyDrop::new(NonCopy);
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foo.a; //~ ERROR access to union field is unsafe
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let foo = Foo { a: 42 };
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foo.b; //~ ERROR access to union field is unsafe
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let mut foo = Foo { a: 42 };
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foo.b = foo.b;
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//~^ ERROR access to union field is unsafe
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}
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