Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/tests/ui/regions/regions-free-region-ordering-callee.rs b/tests/ui/regions/regions-free-region-ordering-callee.rs
new file mode 100644
index 000000000..8158e81e1
--- /dev/null
+++ b/tests/ui/regions/regions-free-region-ordering-callee.rs
@@ -0,0 +1,30 @@
+// Tests that callees correctly infer an ordering between free regions
+// that appear in their parameter list.  See also
+// regions-free-region-ordering-caller.rs
+
+fn ordering1<'a, 'b>(x: &'a &'b usize) -> &'a usize {
+    // It is safe to assume that 'a <= 'b due to the type of x
+    let y: &'b usize = &**x;
+    return y;
+}
+
+fn ordering2<'a, 'b>(x: &'a &'b usize, y: &'a usize) -> &'b usize {
+    // However, it is not safe to assume that 'b <= 'a
+    &*y
+    //~^ ERROR lifetime may not live long enough
+}
+
+fn ordering3<'a, 'b>(x: &'a usize, y: &'b usize) -> &'a &'b usize {
+    // Do not infer an ordering from the return value.
+    let z: &'b usize = &*x;
+    //~^ ERROR lifetime may not live long enough
+    panic!();
+}
+
+// see regions-free-region-ordering-callee-4.rs
+
+fn ordering5<'a, 'b>(a: &'a usize, b: &'b usize, x: Option<&'a &'b usize>) {
+    let z: Option<&'a &'b usize> = None;
+}
+
+fn main() {}