src/test/ui/packed-struct/packed-struct-transmute.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 // This assumes the packed and non-packed structs are different sizes.
  12
  13 // the error points to the start of the file, not the line with the
  14 // transmute
  15
  16 // normalize-stderr-test "\d+ bits" -> "N bits"
  17 // error-pattern: transmute called with types of different sizes
  18
  19 use std::mem;
  20
  21 #[repr(packed)]
  22 struct Foo {
  23     bar: u8,
  24     baz: usize
  25 }
  26
  27 #[derive(Debug)]
  28 struct Oof {
  29     rab: u8,
  30     zab: usize
  31 }
  32
  33 fn main() {
  34     let foo = Foo { bar: 1, baz: 10 };
  35     unsafe {
  36         let oof: Oof = mem::transmute(foo);
  37         println!("{:?}", oof);
  38     }
  39 }