src/test/compile-fail/const-err.rs

   1 // Copyright 2012 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 #![allow(exceeding_bitshifts)]
  13
  14 fn black_box<T>(_: T) {
  15     unimplemented!()
  16 }
  17
  18 #[rustc_no_mir] // FIXME #29769 MIR overflow checking is TBD.
  19 fn main() {
  20     let a = -std::i8::MIN;
  21     //~^ WARN attempted to negate with overflow
  22     let b = 200u8 + 200u8 + 200u8;
  23     //~^ WARN attempted to add with overflow
  24     //~^^ WARN attempted to add with overflow
  25     let c = 200u8 * 4;
  26     //~^ WARN attempted to multiply with overflow
  27     let d = 42u8 - (42u8 + 1);
  28     //~^ WARN attempted to subtract with overflow
  29     let _e = [5u8][1];
  30     //~^ ERROR const index-expr is out of bounds
  31     black_box(a);
  32     black_box(b);
  33     black_box(c);
  34     black_box(d);
  35 }