Add test

src/test/run-pass/invalid_const_promotion.rs

@@ -0,0 +1,35 @@
+// Copyright 2018 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(const_fn)]
+#![allow(const_err)]
+
+use std::env;
+use std::process::{Command, Stdio};
+
+const fn bar() -> usize { 0 - 1 }
+
+fn foo() {
+    let _: &'static _ = &bar();
+}
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    if args.len() > 1 && args[1] == "test" {
+        foo();
+        return;
+    }
+
+    let mut p = Command::new(&args[0])
+        .stdout(Stdio::piped())
+        .stdin(Stdio::piped())
+        .arg("test").output().unwrap();
+    assert!(!p.status.success());
+}