src/test/compile-fail/const-eval-overflow-2.rs

   1 // Copyright 2015 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 // Evaluation of constants in refutable patterns goes through
  12 // different compiler control-flow paths.
  13
  14 #![allow(unused_imports)]
  15
  16 use std::fmt;
  17 use std::{i8, i16, i32, i64, isize};
  18 use std::{u8, u16, u32, u64, usize};
  19
  20 const NEG_128: i8 = -128;
  21 const NEG_NEG_128: i8 = -NEG_128;
  22 //~^ ERROR constant evaluation error: attempted to negate with overflow
  23 //~| ERROR attempted to negate with overflow
  24 //~| ERROR attempted to negate with overflow
  25
  26 fn main() {
  27     match -128i8 {
  28         NEG_NEG_128 => println!("A"), //~ NOTE in pattern here
  29         _ => println!("B"),
  30     }
  31 }