1 files changed, 35 insertions, 0 deletions
diff --git a/src/test/ui/object-lifetime/object-lifetime-default-inferred.rs b/src/test/ui/object-lifetime/object-lifetime-default-inferred.rs
new file mode 100644
index 000000000..8a1156b8f
--- /dev/null
+++ b/src/test/ui/object-lifetime/object-lifetime-default-inferred.rs
@@ -0,0 +1,35 @@
+// run-pass
+// Test that even with prior inferred parameters, object lifetimes of objects after are still
+// valid.
+
+// pretty-expanded FIXME #23616
+
+#![allow(dead_code)]
+#![feature(generic_arg_infer)]
+
+trait Test {
+    fn foo(&self) { }
+}
+
+struct Foo;
+impl Test for Foo {}
+
+struct SomeStruct<'a> {
+    t: &'a dyn Test,
+    u: &'a (dyn Test+'a),
+}
+
+fn a<'a, const N: usize>(_: [u8; N], t: &'a (dyn Test+'a), mut ss: SomeStruct<'a>) {
+    ss.t = t;
+}
+
+fn b<'a, T>(_: T, t: &'a (dyn Test+'a), mut ss: SomeStruct<'a>) {
+    ss.u = t;
+}
+
+fn main() {
+    // Inside a function body, we can just infer both
+    // lifetimes, to allow &'tmp (Display+'static).
+    a::<_>([], &Foo as &dyn Test, SomeStruct{t:&Foo,u:&Foo});
+    b::<_>(0u8, &Foo as &dyn Test, SomeStruct{t:&Foo,u:&Foo});
+}