src/test/ui/enum/enum-size-variance.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 // run-pass
  12
  13 #![warn(variant_size_differences)]
  14 #![allow(dead_code)]
  15
  16 // Note that the following test works because all fields of the enum variants are of the same size.
  17 // If this test is modified and the reordering logic in librustc/ty/layout.rs kicks in, it fails.
  18
  19 enum Enum1 { }
  20
  21 enum Enum2 { A, B, C }
  22
  23 enum Enum3 { D(i64), E, F }
  24
  25 enum Enum4 { H(i64), I(i64), J }
  26
  27 enum Enum5 {
  28     L(i64, i64, i64, i64), //~ WARNING three times larger
  29     M(i64),
  30     N
  31 }
  32
  33 enum Enum6<T, U> {
  34     O(T),
  35     P(U),
  36     Q(i64)
  37 }
  38
  39 #[allow(variant_size_differences)]
  40 enum Enum7 {
  41     R(i64, i64, i64, i64),
  42     S(i64),
  43     T
  44 }
  45 pub fn main() { }