adding ui tests

Author: gaurikholkar

src/test/ui/lifetime-errors/ex3-both-anon-regions-both-are-structs-latebound-regions.rs

@@ -0,0 +1,18 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+struct Ref<'a> {
+    x: &'a u32,
+}
+
+fn foo<'a, 'b>(mut x: Vec<Ref<'a>>, y: Ref<'b>) {
+    x.push(y);
+}
+
+fn main() {}

src/test/ui/lifetime-errors/ex3-both-anon-regions-both-are-structs-latebound-regions.stderr

@@ -0,0 +1,10 @@
+error[E0623]: lifetime mismatch
+  --> $DIR/ex3-both-anon-regions-both-are-structs-latebound-regions.rs:15:12
+   |
+14 | fn foo<'a, 'b>(mut x: Vec<Ref<'a>>, y: Ref<'b>) {
+   |                           -------      ------- these two types are declared with different lifetimes...
+15 |     x.push(y);
+   |            ^ ...but data from `y` flows into `x` here
+
+error: aborting due to previous error
+