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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:18:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:18:58 +0000 |
commit | a4b7ed7a42c716ab9f05e351f003d589124fd55d (patch) | |
tree | b620cd3f223850b28716e474e80c58059dca5dd4 /tests/ui/generator/drop-and-replace.rs | |
parent | Adding upstream version 1.67.1+dfsg1. (diff) | |
download | rustc-a4b7ed7a42c716ab9f05e351f003d589124fd55d.tar.xz rustc-a4b7ed7a42c716ab9f05e351f003d589124fd55d.zip |
Adding upstream version 1.68.2+dfsg1.upstream/1.68.2+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/generator/drop-and-replace.rs')
-rw-r--r-- | tests/ui/generator/drop-and-replace.rs | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/tests/ui/generator/drop-and-replace.rs b/tests/ui/generator/drop-and-replace.rs new file mode 100644 index 000000000..a9a50a122 --- /dev/null +++ b/tests/ui/generator/drop-and-replace.rs @@ -0,0 +1,45 @@ +// run-pass +// Regression test for incorrect DropAndReplace behavior introduced in #60840 +// and fixed in #61373. When combined with the optimization implemented in +// #60187, this produced incorrect code for generators when a saved local was +// re-assigned. + +#![feature(generators, generator_trait)] + +use std::ops::{Generator, GeneratorState}; +use std::pin::Pin; + +#[derive(Debug, PartialEq)] +struct Foo(i32); + +impl Drop for Foo { + fn drop(&mut self) { } +} + +fn main() { + let mut a = || { + let mut x = Foo(4); + yield; + assert_eq!(x.0, 4); + + // At one point this tricked our dataflow analysis into thinking `x` was + // StorageDead after the assignment. + x = Foo(5); + assert_eq!(x.0, 5); + + { + let y = Foo(6); + yield; + assert_eq!(y.0, 6); + } + + assert_eq!(x.0, 5); + }; + + loop { + match Pin::new(&mut a).resume(()) { + GeneratorState::Complete(()) => break, + _ => (), + } + } +} |