src/test/run-pass/feature-gate-negate-unsigned.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 // Test that negating unsigned integers is gated by `negate_unsigned` feature
  12 // gate
  13
  14 struct S;
  15 impl std::ops::Neg for S {
  16     type Output = u32;
  17     fn neg(self) -> u32 { 0 }
  18 }
  19
  20 const _MAX: usize = -1;
  21 //~^ WARN unary negation of unsigned integers will be feature gated in the future
  22
  23 fn main() {
  24     let a = -1;
  25     //~^ WARN unary negation of unsigned integers will be feature gated in the future
  26     let _b : u8 = a; // for infering variable a to u8.
  27
  28     -a;
  29     //~^ WARN unary negation of unsigned integers will be feature gated in the future
  30
  31     let _d = -1u8;
  32     //~^ WARN unary negation of unsigned integers will be feature gated in the future
  33
  34     for _ in -10..10u8 {}
  35     //~^ WARN unary negation of unsigned integers will be feature gated in the future
  36
  37     -S; // should not trigger the gate; issue 26840
  38 }