mirror of https://github.com/rust-lang/rust
34 lines
978 B
Rust
34 lines
978 B
Rust
// Checks that unions use type based qualification. Regression test for issue #90268.
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use std::cell::Cell;
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use std::mem::ManuallyDrop;
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union U { i: u32, c: ManuallyDrop<Cell<u32>> }
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const C1: ManuallyDrop<Cell<u32>> = {
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unsafe { U { c: ManuallyDrop::new(Cell::new(0)) }.c }
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};
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const C2: ManuallyDrop<Cell<u32>> = {
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unsafe { U { i : 0 }.c }
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};
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const C3: ManuallyDrop<Cell<u32>> = {
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let mut u = U { i: 0 };
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u.i = 1;
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unsafe { u.c }
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};
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const C4: U = U { i: 0 };
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const C5: [U; 1] = [U {i : 0}; 1];
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fn main() {
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// Interior mutability should prevent promotion.
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let _: &'static _ = &C1; //~ ERROR temporary value dropped while borrowed
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let _: &'static _ = &C2; //~ ERROR temporary value dropped while borrowed
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let _: &'static _ = &C3; //~ ERROR temporary value dropped while borrowed
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let _: &'static _ = &C4; //~ ERROR temporary value dropped while borrowed
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let _: &'static _ = &C5; //~ ERROR temporary value dropped while borrowed
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}
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