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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/issue-53548.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/issue-53548.rs')
-rw-r--r-- | tests/ui/generator/issue-53548.rs | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/tests/ui/generator/issue-53548.rs b/tests/ui/generator/issue-53548.rs new file mode 100644 index 000000000..3ebabb914 --- /dev/null +++ b/tests/ui/generator/issue-53548.rs @@ -0,0 +1,38 @@ +// Regression test for #53548. The `Box<dyn Trait>` type below is +// expanded to `Box<dyn Trait + 'static>`, but the generator "witness" +// that results is `for<'r> { Box<dyn Trait + 'r> }`. The WF code was +// encountering an ICE (when debug-assertions were enabled) and an +// unexpected compilation error (without debug-asserions) when trying +// to process this `'r` region bound. In particular, to be WF, the +// region bound must meet the requirements of the trait, and hence we +// got `for<'r> { 'r: 'static }`. This would ICE because the `Binder` +// constructor we were using was assering that no higher-ranked +// regions were involved (because the WF code is supposed to skip +// those). The error (if debug-asserions were disabled) came because +// we obviously cannot prove that `'r: 'static` for any region `'r`. +// Pursuant with our "lazy WF" strategy for higher-ranked regions, the +// fix is not to require that `for<'r> { 'r: 'static }` holds (this is +// also analogous to what we would do for higher-ranked regions +// appearing within the trait in other positions). +// +// check-pass + +#![feature(generators)] + +use std::cell::RefCell; +use std::rc::Rc; + +trait Trait: 'static {} + +struct Store<C> { + inner: Rc<RefCell<Option<C>>>, +} + +fn main() { + Box::new(static move || { + let store = Store::<Box<dyn Trait>> { + inner: Default::default(), + }; + yield (); + }); +} |