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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/traits/object/with-lifetime-bound.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 '')
-rw-r--r-- | src/test/ui/traits/object/with-lifetime-bound.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/test/ui/traits/object/with-lifetime-bound.rs b/src/test/ui/traits/object/with-lifetime-bound.rs new file mode 100644 index 000000000..05aab5e3b --- /dev/null +++ b/src/test/ui/traits/object/with-lifetime-bound.rs @@ -0,0 +1,34 @@ +// run-pass +// Uncovered during work on new scoping rules for safe destructors +// as an important use case to support properly. + + +pub struct E<'a> { + pub f: &'a u8, +} +impl<'b> E<'b> { + pub fn m(&self) -> &'b u8 { self.f } +} + +pub struct P<'c> { + pub g: &'c u8, +} +pub trait M { + fn n(&self) -> u8; +} +impl<'d> M for P<'d> { + fn n(&self) -> u8 { *self.g } +} + +fn extension<'e>(x: &'e E<'e>) -> Box<dyn M+'e> { + loop { + let p = P { g: x.m() }; + return Box::new(p) as Box<dyn M+'e>; + } +} + +fn main() { + let w = E { f: &10 }; + let o = extension(&w); + assert_eq!(o.n(), 10); +} |