33 lines
1.0 KiB
Rust
33 lines
1.0 KiB
Rust
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// Check that method bounds declared on traits/impls in a cross-crate
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// scenario work. This is the library portion of the test.
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pub enum MaybeOwned<'a> {
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Owned(isize),
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Borrowed(&'a isize)
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}
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pub struct Inv<'a> { // invariant w/r/t 'a
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x: &'a mut &'a isize
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}
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// I encountered a bug at some point with encoding the IntoMaybeOwned
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// trait, so I'll use that as the template for this test.
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pub trait IntoMaybeOwned<'a> {
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fn into_maybe_owned(self) -> MaybeOwned<'a>;
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// Note: without this `into_inv` method, the trait is
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// contravariant w/r/t `'a`, since if you look strictly at the
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// interface, it only returns `'a`. This complicates the
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// downstream test since it wants invariance to force an error.
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// Hence we add this method.
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fn into_inv(self) -> Inv<'a>;
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fn bigger_region<'b:'a>(self, b: Inv<'b>);
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}
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impl<'a> IntoMaybeOwned<'a> for Inv<'a> {
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fn into_maybe_owned(self) -> MaybeOwned<'a> { panic!() }
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fn into_inv(self) -> Inv<'a> { panic!() }
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fn bigger_region<'b:'a>(self, b: Inv<'b>) { panic!() }
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}
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