mirror of https://github.com/rust-lang/rust
44 lines
865 B
Rust
44 lines
865 B
Rust
// Ensure that *any* assignment to the return place of a value with interior mutability
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// disqualifies it from promotion.
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use std::cell::Cell;
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const X: Option<Cell<i32>> = {
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let mut x = None;
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if false {
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x = Some(Cell::new(4));
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}
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x
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};
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const Y: Option<Cell<i32>> = {
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let mut y = Some(Cell::new(4));
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if true {
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y = None;
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}
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y
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};
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const Z: Option<Cell<i32>> = {
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let mut z = None;
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let mut i = 0;
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while i < 10 {
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if i == 8 {
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z = Some(Cell::new(4));
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}
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if i == 9 {
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z = None;
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}
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i += 1;
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}
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z
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};
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fn main() {
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let x: &'static _ = &X; //~ ERROR temporary value dropped while borrowed
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let y: &'static _ = &Y; //~ ERROR temporary value dropped while borrowed
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let z: &'static _ = &Z; //~ ERROR temporary value dropped while borrowed
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}
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