diff options
Diffstat (limited to 'src/test/ui/nll/issue-57265-return-type-wf-check.rs')
-rw-r--r-- | src/test/ui/nll/issue-57265-return-type-wf-check.rs | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/test/ui/nll/issue-57265-return-type-wf-check.rs b/src/test/ui/nll/issue-57265-return-type-wf-check.rs new file mode 100644 index 000000000..8fb8351ce --- /dev/null +++ b/src/test/ui/nll/issue-57265-return-type-wf-check.rs @@ -0,0 +1,24 @@ +use std::any::Any; + +#[derive(Debug, Clone)] +struct S<T: 'static>(T); + +// S<&'a T> is in the return type, so we get an implied bound +// &'a T: 'static +fn foo<'a, T>(x: &'a T) -> (S<&'a T>, Box<dyn Any + 'static>) { + let y = S(x); + + let z = Box::new(y.clone()) as Box<dyn Any + 'static>; + (y, z) +} + +fn main() { + let x = 5; + + // Check that we require that the argument is of type `&'static String`, + // so that the return type is well-formed. + let (_, z) = foo(&"hello".to_string()); + //~^ ERROR temporary value dropped while borrowed + + println!("{:?}", z.downcast_ref::<S<&'static String>>()); +} |