src/test/run-pass/dst-coercions.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 // Test coercions involving DST and/or raw pointers
  12
  13 // pretty-expanded FIXME #23616
  14
  15 struct S;
  16 trait T { fn dummy(&self) { } }
  17 impl T for S {}
  18
  19 pub fn main() {
  20     let x: &T = &S;
  21     // Test we can convert from &-ptr to *-ptr of trait objects
  22     let x: *const T = &S;
  23
  24     // Test we can convert from &-ptr to *-ptr of struct pointer (not DST)
  25     let x: *const S = &S;
  26
  27     // As above, but mut
  28     let x: &mut T = &mut S;
  29     let x: *mut T = &mut S;
  30
  31     let x: *mut S = &mut S;
  32
  33     // Test we can change the mutability from mut to const.
  34     let x: &T = &mut S;
  35     let x: *const T = &mut S;
  36 }