Add a feature_gate test for raw pointer self

Author: mikeyhew

src/test/ui/feature-gate-arbitrary_self_types-raw-pointer.rs

@@ -0,0 +1,28 @@
+// 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 Foo;
+
+impl Foo {
+    fn foo(self: *const Self) {}
+    //~^ ERROR raw pointer `self` is unstable
+}
+
+trait Bar {
+    fn bar(self: *const Self);
+    //~^ ERROR raw pointer `self` is unstable
+}
+
+impl Bar for () {
+    fn bar(self: *const Self) {}
+    //~^ ERROR raw pointer `self` is unstable
+}
+
+fn main() {}

src/test/ui/feature-gate-arbitrary_self_types-raw-pointer.stderr

@@ -0,0 +1,29 @@
+error: raw pointer `self` is unstable (see issue #44874)
+  --> $DIR/feature-gate-arbitrary_self_types-raw-pointer.rs:19:18
+   |
+19 |     fn bar(self: *const Self);
+   |                  ^^^^^^^^^^^
+   |
+   = help: add #![feature(arbitrary_self_types)] to the crate attributes to enable
+   = help: consider changing to `self`, `&self`, `&mut self`, or `self: Box<Self>`
+
+error: raw pointer `self` is unstable (see issue #44874)
+  --> $DIR/feature-gate-arbitrary_self_types-raw-pointer.rs:14:18
+   |
+14 |     fn foo(self: *const Self) {}
+   |                  ^^^^^^^^^^^
+   |
+   = help: add #![feature(arbitrary_self_types)] to the crate attributes to enable
+   = help: consider changing to `self`, `&self`, `&mut self`, or `self: Box<Self>`
+
+error: raw pointer `self` is unstable (see issue #44874)
+  --> $DIR/feature-gate-arbitrary_self_types-raw-pointer.rs:24:18
+   |
+24 |     fn bar(self: *const Self) {}
+   |                  ^^^^^^^^^^^
+   |
+   = help: add #![feature(arbitrary_self_types)] to the crate attributes to enable
+   = help: consider changing to `self`, `&self`, `&mut self`, or `self: Box<Self>`
+
+error: aborting due to 3 previous errors
+