Merging upstream version 1.68.2+dfsg1.

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

1 files changed, 27 insertions, 0 deletions

diff --git a/tests/ui/variance/variance-contravariant-arg-object.rs b/tests/ui/variance/variance-contravariant-arg-object.rs
new file mode 100644
index 000000000..701fcaf69
--- /dev/null
+++ b/tests/ui/variance/variance-contravariant-arg-object.rs
@@ -0,0 +1,27 @@
+#![allow(dead_code)]
+
+// Test that even when `T` is only used in contravariant position, it
+// is treated as invariant.
+
+trait Get<T> : 'static {
+    fn get(&self, t: T);
+}
+
+fn get_min_from_max<'min, 'max>(v: Box<dyn Get<&'max i32>>)
+                                -> Box<dyn Get<&'min i32>>
+    where 'max : 'min
+{
+    v
+    //~^ ERROR lifetime may not live long enough
+}
+
+fn get_max_from_min<'min, 'max>(v: Box<dyn Get<&'min i32>>)
+                                -> Box<dyn Get<&'max i32>>
+    where 'max : 'min
+{
+    // Previously OK:
+    v
+    //~^ ERROR lifetime may not live long enough
+}
+
+fn main() { }