1 files changed, 28 insertions, 0 deletions
diff --git a/src/test/ui/nll/ty-outlives/projection-where-clause-env.rs b/src/test/ui/nll/ty-outlives/projection-where-clause-env.rs
new file mode 100644
index 000000000..a41116232
--- /dev/null
+++ b/src/test/ui/nll/ty-outlives/projection-where-clause-env.rs
@@ -0,0 +1,28 @@
+// Test that when we have a `<T as MyTrait<'a>>::Output: 'a`
+// relationship in the environment we take advantage of it.  In this
+// case, that means we **don't** have to prove that `T: 'a`.
+//
+// Regression test for #53121.
+//
+// check-pass
+
+trait MyTrait<'a> {
+    type Output;
+}
+
+fn foo<'a, T>() -> &'a ()
+where
+    T: MyTrait<'a>,
+    <T as MyTrait<'a>>::Output: 'a,
+{
+    bar::<T::Output>()
+}
+
+fn bar<'a, T>() -> &'a ()
+where
+    T: 'a,
+{
+    &()
+}
+
+fn main() {}