Bless output of test borrowck/return-local-binding-from-desugaring.rs for Polonius
diff --git a/src/test/ui/async-await/async-borrowck-escaping-closure-error.polonius.stderr b/src/test/ui/async-await/async-borrowck-escaping-closure-error.polonius.stderr
new file mode 100644
index 0000000..5f20367
--- /dev/null
+++ b/src/test/ui/async-await/async-borrowck-escaping-closure-error.polonius.stderr
@@ -0,0 +1,16 @@
+error[E0597]: `x` does not live long enough
+ --> $DIR/async-borrowck-escaping-closure-error.rs:5:24
+ |
+LL | Box::new((async || x)())
+ | -------------------^----
+ | | | |
+ | | | borrowed value does not live long enough
+ | | value captured here
+ | borrow later used here
+LL |
+LL | }
+ | - `x` dropped here while still borrowed
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0597`.
