Add test case for issue 23477

Author: c3st7n

src/test/debuginfo/issue-23477.rs

@@ -0,0 +1,24 @@
+// 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.
+
+#![crate_type = "lib"]
+
+extern crate core;
+
+pub struct Dst {
+    pub a: (),
+    pub b: (),
+    pub data: [u8],
+}
+
+pub unsafe fn borrow(bytes: &[u8]) -> &Dst {
+    let dst: &Dst = std::mem::transmute((bytes.as_ptr(), bytes.len()));
+    dst
+}