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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/consts/control-flow/interior-mutability.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/consts/control-flow/interior-mutability.rs')
-rw-r--r-- | src/test/ui/consts/control-flow/interior-mutability.rs | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/src/test/ui/consts/control-flow/interior-mutability.rs b/src/test/ui/consts/control-flow/interior-mutability.rs new file mode 100644 index 000000000..a6d44237b --- /dev/null +++ b/src/test/ui/consts/control-flow/interior-mutability.rs @@ -0,0 +1,43 @@ +// Ensure that *any* assignment to the return place of a value with interior mutability +// disqualifies it from promotion. + +use std::cell::Cell; + +const X: Option<Cell<i32>> = { + let mut x = None; + if false { + x = Some(Cell::new(4)); + } + x +}; + +const Y: Option<Cell<i32>> = { + let mut y = Some(Cell::new(4)); + if true { + y = None; + } + y +}; + +const Z: Option<Cell<i32>> = { + let mut z = None; + let mut i = 0; + while i < 10 { + if i == 8 { + z = Some(Cell::new(4)); + } + + if i == 9 { + z = None; + } + + i += 1; + } + z +}; + +fn main() { + let x: &'static _ = &X; //~ ERROR temporary value dropped while borrowed + let y: &'static _ = &Y; //~ ERROR temporary value dropped while borrowed + let z: &'static _ = &Z; //~ ERROR temporary value dropped while borrowed +} |