--- /dev/null
+// Copyright 2014 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(rustc_attrs)]
+#![feature(slice_patterns)]
+#![allow(dead_code)]
+#![deny(illegal_floating_point_constant_pattern)]
+
+// Matching against NaN should result in a warning
+
+use std::f64::NAN;
+
+#[rustc_error]
+fn main() {
+ let x = NAN;
+ match x {
+ NAN => {}, //~ ERROR floating point constants cannot be used
+ //~| WARNING hard error
+ _ => {},
+ };
+
+ match [x, 1.0] {
+ [NAN, _] => {}, //~ ERROR floating point constants cannot be used
+ //~| WARNING hard error
+ _ => {},
+ };
+}