rust/tests/ui/regions/regions-free-region-ordering-incorrect.rs
2023-01-11 09:32:08 +00:00

23 lines
614 B
Rust

// 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 { //~ ERROR lifetime may not live long enough
Some(ref next) => next.get(),
None => &self.val
}
}
}
fn main() {}