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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/ui/generator/yield-while-iterating.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/generator/yield-while-iterating.rs')
-rw-r--r-- | tests/ui/generator/yield-while-iterating.rs | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/tests/ui/generator/yield-while-iterating.rs b/tests/ui/generator/yield-while-iterating.rs new file mode 100644 index 000000000..985e5d8bd --- /dev/null +++ b/tests/ui/generator/yield-while-iterating.rs @@ -0,0 +1,75 @@ +#![feature(generators, generator_trait)] + +use std::ops::{GeneratorState, Generator}; +use std::cell::Cell; +use std::pin::Pin; + +fn yield_during_iter_owned_data(x: Vec<i32>) { + // The generator owns `x`, so we error out when yielding with a + // reference to it. This winds up becoming a rather confusing + // regionck error -- in particular, we would freeze with the + // reference in scope, and it doesn't live long enough. + let _b = move || { + for p in &x { //~ ERROR + yield(); + } + }; +} + +fn yield_during_iter_borrowed_slice(x: &[i32]) { + let _b = move || { + for p in x { + yield(); + } + }; +} + +fn yield_during_iter_borrowed_slice_2() { + let mut x = vec![22_i32]; + let _b = || { + for p in &x { + yield(); + } + }; + println!("{:?}", x); +} + +fn yield_during_iter_borrowed_slice_3() { + // OK to take a mutable ref to `x` and yield + // up pointers from it: + let mut x = vec![22_i32]; + let mut b = || { + for p in &mut x { + yield p; + } + }; + Pin::new(&mut b).resume(()); +} + +fn yield_during_iter_borrowed_slice_4() { + // ...but not OK to do that while reading + // from `x` too + let mut x = vec![22_i32]; + let mut b = || { + for p in &mut x { + yield p; + } + }; + println!("{}", x[0]); //~ ERROR + Pin::new(&mut b).resume(()); +} + +fn yield_during_range_iter() { + // Should be OK. + let mut b = || { + let v = vec![1,2,3]; + let len = v.len(); + for i in 0..len { + let x = v[i]; + yield x; + } + }; + Pin::new(&mut b).resume(()); +} + +fn main() { } |