45 lines
1008 B
Rust
45 lines
1008 B
Rust
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// Regression test for incorrect DropAndReplace behavior introduced in #60840
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// and fixed in #61373. When combined with the optimization implemented in
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// #60187, this produced incorrect code for generators when a saved local was
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// re-assigned.
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#![feature(generators, generator_trait)]
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use std::ops::{Generator, GeneratorState};
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use std::pin::Pin;
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#[derive(Debug, PartialEq)]
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struct Foo(i32);
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impl Drop for Foo {
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fn drop(&mut self) { }
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}
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fn main() {
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let mut a = || {
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let mut x = Foo(4);
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yield;
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assert_eq!(x.0, 4);
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// At one point this tricked our dataflow analysis into thinking `x` was
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// StorageDead after the assignment.
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x = Foo(5);
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assert_eq!(x.0, 5);
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{
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let y = Foo(6);
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yield;
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assert_eq!(y.0, 6);
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}
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assert_eq!(x.0, 5);
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};
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loop {
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match Pin::new(&mut a).resume() {
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GeneratorState::Complete(()) => break,
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_ => (),
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}
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}
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}
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