Add test for issue #29595

Author: mattico

src/test/ui/span/issue-29595.rs

@@ -0,0 +1,19 @@
+// Copyright 2012 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(associated_consts)]
+
+trait Tr {
+    const C: Self;
+}
+
+fn main() {
+    let a: u8 = Tr::C; //~ ERROR the trait bound `u8: Tr` is not satisfied
+}

src/test/ui/span/issue-29595.stderr

@@ -0,0 +1,10 @@
+error[E0277]: the trait bound `u8: Tr` is not satisfied
+  --> $DIR/issue-29595.rs:18:17
+   |
+18 |     let a: u8 = Tr::C; //~ ERROR the trait bound `u8: Tr` is not satisfied
+   |                 ^^^^^ the trait `Tr` is not implemented for `u8`
+   |
+   = note: required by `Tr::C`
+
+error: aborting due to previous error
+