auto merge of #8078 : luqmana/rust/gst, r=Aatch

Fixes #5917 by not trying to treat `&[T]` as a slice since it already is one.

src/test/run-pass/static-vec-autoref.rs

@@ -0,0 +1,21 @@
+// Copyright 2013 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 T(&'static [int]);
+
+static A: T = T(&'static [5, 4, 3]);
+static B: T = T(&[5, 4, 3]);
+static C: T = T([5, 4, 3]);
+
+pub fn main() {
+    assert_eq!(A[0], 5);
+    assert_eq!(B[1], 4);
+    assert_eq!(C[2], 3);
+}