Added regression test for NLL raw pointer cast bug

Author: sunjay

src/test/run-pass/nll/issue-53123-raw-pointer-cast.rs

@@ -0,0 +1,35 @@
+// Copyright 2016 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(nll)]
+#![allow(unused_variables)]
+
+pub trait TryTransform {
+    fn try_transform<F>(self, f: F)
+    where
+        Self: Sized,
+        F: FnOnce(Self);
+}
+
+impl<'a, T> TryTransform for &'a mut T {
+    fn try_transform<F>(self, f: F)
+    where
+        // The bug was that `Self: Sized` caused the lifetime of `this` to "extend" for all
+        // of 'a instead of only lasting as long as the binding is used (for just that line).
+        Self: Sized,
+        F: FnOnce(Self),
+    {
+        let this: *mut T = self as *mut T;
+        f(self);
+    }
+}
+
+fn main() {
+}