Bless output of test nll/return-ref-mut-issue-46557.rs for Polonius

src/test/ui/nll/return-ref-mut-issue-46557.polonius.stderr

@@ -0,0 +1,15 @@
+error[E0716]: temporary value dropped while borrowed
+  --> $DIR/return-ref-mut-issue-46557.rs:4:21
+   |
+LL |     let ref mut x = 1234543;
+   |                     ^^^^^^^ creates a temporary which is freed while still in use
+LL |     x
+   |     - borrow later used here
+LL | }
+   | - temporary value is freed at the end of this statement
+   |
+   = note: consider using a `let` binding to create a longer lived value
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0716`.