src/test/compile-fail/issue-6804.rs

   1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 #![feature(rustc_attrs)]
  12 #![feature(slice_patterns)]
  13 #![allow(dead_code)]
  14
  15 // Matching against NaN should result in a warning
  16
  17 use std::f64::NAN;
  18
  19 #[rustc_error]
  20 fn main() { //~ ERROR compilation successful
  21     let x = NAN;
  22     match x {
  23         NAN => {},
  24         _ => {},
  25     };
  26     //~^^^ WARNING unmatchable NaN in pattern, use the is_nan method in a guard instead
  27     //~| WARNING floating point constants cannot be used
  28     //~| WARNING this was previously accepted
  29     match [x, 1.0] {
  30         [NAN, _] => {},
  31         _ => {},
  32     };
  33     //~^^^ WARNING unmatchable NaN in pattern, use the is_nan method in a guard instead
  34     //~| WARNING floating point constants cannot be used
  35     //~| WARNING this was previously accepted
  36 }