Add nll test output

Author: estebank

src/test/ui/impl-trait/static-return-lifetime-infered.nll.stderr

@@ -0,0 +1,26 @@
+warning: not reporting region error due to nll
+  --> $DIR/static-return-lifetime-infered.rs:17:16
+   |
+LL |         self.x.iter().map(|a| a.0)
+   |                ^^^^
+
+warning: not reporting region error due to nll
+  --> $DIR/static-return-lifetime-infered.rs:21:16
+   |
+LL |         self.x.iter().map(|a| a.0)
+   |                ^^^^
+
+error: free region `` does not outlive free region `'static`
+  --> $DIR/static-return-lifetime-infered.rs:17:9
+   |
+LL |         self.x.iter().map(|a| a.0)
+   |         ^^^^^^^^^^^^^
+
+error: free region `'a` does not outlive free region `'static`
+  --> $DIR/static-return-lifetime-infered.rs:21:9
+   |
+LL |         self.x.iter().map(|a| a.0)
+   |         ^^^^^^^^^^^^^
+
+error: aborting due to 2 previous errors
+