| // Test that free regions ordering only goes one way. That is, |
| // we have `&'a Node<'b, T>`, which implies that `'a <= 'b`, |
| // but not `'b <= 'a`. Hence, returning `&self.val` (which has lifetime |
| // `'a`) where `'b` is expected yields an error. |
| // |
| // This test began its life as a test for issue #4325. |
| |
| struct Node<'b, T: 'b> { |
| val: T, |
| next: Option<&'b Node<'b, T>> |
| } |
| |
| impl<'b, T> Node<'b, T> { |
| fn get<'a>(&'a self) -> &'b T { |
| match self.next { |
| Some(ref next) => next.get(), |
| None => &self.val //~ ERROR cannot infer |
| } |
| } |
| } |
| |
| fn main() {} |