--- /dev/null
+// 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.
+
+// must-compile-successfully
+
+// if `X` were used instead of `x`, `X - 10` would result in a lint.
+// This file should never produce a lint, no matter how the const
+// propagator is improved.
+
+#![deny(warnings)]
+
+const X: u32 = 5;
+
+fn main() {
+ let x = X;
+ if x > 10 {
+ println!("{}", x - 10);
+ } else {
+ println!("{}", 10 - x);
+ }
+}