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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/generator/issue-53548.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/generator/issue-53548.rs')
-rw-r--r-- | src/test/ui/generator/issue-53548.rs | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/test/ui/generator/issue-53548.rs b/src/test/ui/generator/issue-53548.rs new file mode 100644 index 000000000..3ebabb914 --- /dev/null +++ b/src/test/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 (); + }); +} |