From afd8cf25f50fa94c7717c780abbf8c266e7cc96d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matthias=20Kr=C3=BCger?= <matthias.krueger@famsik.de>
Date: Wed, 29 Jun 2022 21:55:10 +0200
Subject: [PATCH] add test for 72793

Fixes #72793

r? @oli-obk
---
 .../ui/type-alias-impl-trait/issue-72793.rs   | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 src/test/ui/type-alias-impl-trait/issue-72793.rs

diff --git a/src/test/ui/type-alias-impl-trait/issue-72793.rs b/src/test/ui/type-alias-impl-trait/issue-72793.rs
new file mode 100644
index 0000000000000..828c871143ad5
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-72793.rs
@@ -0,0 +1,25 @@
+// check-pass
+// compile-flags: -Zmir-opt-level=3
+
+#![feature(type_alias_impl_trait)]
+
+trait T { type Item; }
+
+type Alias<'a> = impl T<Item = &'a ()>;
+
+struct S;
+impl<'a> T for &'a S {
+    type Item = &'a ();
+}
+
+fn filter_positive<'a>() -> Alias<'a> {
+    &S
+}
+
+fn with_positive(fun: impl Fn(Alias<'_>)) {
+    fun(filter_positive());
+}
+
+fn main() {
+    with_positive(|_| ());
+}