blob: ce2a3a7db29a3802f4aae0d098014a030ac1fff8 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
// Check that method bounds declared on traits/impls in a cross-crate
// scenario work. This is the library portion of the test.
pub enum MaybeOwned<'a> {
Owned(isize),
Borrowed(&'a isize)
}
pub struct Inv<'a> { // invariant w/r/t 'a
x: &'a mut &'a isize
}
// I encountered a bug at some point with encoding the IntoMaybeOwned
// trait, so I'll use that as the template for this test.
pub trait IntoMaybeOwned<'a> {
fn into_maybe_owned(self) -> MaybeOwned<'a>;
// Note: without this `into_inv` method, the trait is
// contravariant w/r/t `'a`, since if you look strictly at the
// interface, it only returns `'a`. This complicates the
// downstream test since it wants invariance to force an error.
// Hence we add this method.
fn into_inv(self) -> Inv<'a>;
fn bigger_region<'b:'a>(self, b: Inv<'b>);
}
impl<'a> IntoMaybeOwned<'a> for Inv<'a> {
fn into_maybe_owned(self) -> MaybeOwned<'a> { panic!() }
fn into_inv(self) -> Inv<'a> { panic!() }
fn bigger_region<'b:'a>(self, b: Inv<'b>) { panic!() }
}
|