From 218caa410aa38c29984be31a5229b9fa717560ee Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:19:13 +0200
Subject: Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 tests/ui/variance/variance-covariant-arg-object.rs | 27 ++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 tests/ui/variance/variance-covariant-arg-object.rs

(limited to 'tests/ui/variance/variance-covariant-arg-object.rs')

diff --git a/tests/ui/variance/variance-covariant-arg-object.rs b/tests/ui/variance/variance-covariant-arg-object.rs
new file mode 100644
index 000000000..89cf3117a
--- /dev/null
+++ b/tests/ui/variance/variance-covariant-arg-object.rs
@@ -0,0 +1,27 @@
+#![allow(dead_code)]
+
+// Test that even when `T` is only used in covariant position, it
+// is treated as invariant.
+
+trait Get<T> : 'static {
+    fn get(&self) -> T;
+}
+
+fn get_min_from_max<'min, 'max>(v: Box<dyn Get<&'max i32>>)
+                                -> Box<dyn Get<&'min i32>>
+    where 'max : 'min
+{
+    // Previously OK, now an error as traits are invariant.
+    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
+{
+    v
+    //~^ ERROR lifetime may not live long enough
+}
+
+fn main() { }
-- 
cgit v1.2.3