diff options
Diffstat (limited to 'tests/ui/traits/object/with-lifetime-bound.rs')
-rw-r--r-- | tests/ui/traits/object/with-lifetime-bound.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/tests/ui/traits/object/with-lifetime-bound.rs b/tests/ui/traits/object/with-lifetime-bound.rs new file mode 100644 index 000000000..05aab5e3b --- /dev/null +++ b/tests/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); +} |