fix license

Author: RalfJung

src/test/ui/dropck/dropck-union.nll.stderr

@@ -1,5 +1,5 @@
 error[E0597]: `v` does not live long enough
-  --> $DIR/dropck-union.rs:39:18
+  --> $DIR/dropck-union.rs:49:18
    |
 LL |     v.0.set(Some(&v)); //~ ERROR: `v` does not live long enough
    |                  ^^ borrowed value does not live long enough

src/test/ui/dropck/dropck-union.rs

@@ -1,3 +1,13 @@
+// Copyright 2018 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.
+
 #![feature(untagged_unions)]
 
 use std::cell::Cell;

src/test/ui/dropck/dropck-union.stderr

@@ -1,5 +1,5 @@
 error[E0597]: `v` does not live long enough
-  --> $DIR/dropck-union.rs:39:19
+  --> $DIR/dropck-union.rs:49:19
    |
 LL |     v.0.set(Some(&v)); //~ ERROR: `v` does not live long enough
    |                   ^ borrowed value does not live long enough