src/test/compile-fail/enum-discrim-too-small.rs

   1 // Copyright 2013 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
  12 #[repr(u8)]
  13 enum Eu8 {
  14     Au8 = 23,
  15     Bu8 = 223,
  16     Cu8 = -23,
  17     //~^ ERROR cannot apply unary operator `-` to type `u8`
  18 }
  19
  20 #[repr(u16)]
  21 enum Eu16 {
  22     Au16 = 23,
  23     Bu16 = 55555,
  24     Cu16 = -22333,
  25     //~^ ERROR cannot apply unary operator `-` to type `u16`
  26 }
  27
  28 #[repr(u32)]
  29 enum Eu32 {
  30     Au32 = 23,
  31     Bu32 = 3_000_000_000,
  32     Cu32 = -2_000_000_000,
  33     //~^ ERROR cannot apply unary operator `-` to type `u32`
  34 }
  35
  36 #[repr(u64)]
  37 enum Eu64 {
  38     Au32 = 23,
  39     Bu32 = 3_000_000_000,
  40     Cu32 = -2_000_000_000,
  41     //~^ ERROR cannot apply unary operator `-` to type `u64`
  42 }
  43
  44 // u64 currently allows negative numbers, and i64 allows numbers greater than `1<<63`.  This is a
  45 // little counterintuitive, but since the discriminant can store all the bits, and extracting it
  46 // with a cast requires specifying the signedness, there is no loss of information in those cases.
  47 // This also applies to isize and usize on 64-bit targets.
  48
  49 pub fn main() { }