Add test for correct span for type

Test for #27522.

src/test/ui/span/issue-27522.rs

@@ -0,0 +1,19 @@
+// 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.
+
+// Point at correct span for self type
+
+struct SomeType {}
+
+trait Foo {
+    fn handler(self: &SomeType);
+}
+
+fn main() {}

src/test/ui/span/issue-27522.stderr

@@ -0,0 +1,11 @@
+error[E0308]: mismatched method receiver
+  --> $DIR/issue-27522.rs:16:22
+   |
+16 |     fn handler(self: &SomeType);
+   |                      ^^^^^^^^^ expected Self, found struct `SomeType`
+   |
+   = note: expected type `&Self`
+   = note:    found type `&SomeType`
+
+error: aborting due to previous error
+