src/test/compile-fail/fat-ptr-cast.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 trait Trait {}
  12
  13 // Make sure casts between thin-pointer <-> fat pointer obey RFC401
  14 fn main() {
  15     let a: &[i32] = &[1, 2, 3];
  16     let b: Box<[i32]> = Box::new([1, 2, 3]);
  17     let p = a as *const [i32];
  18     let q = a.as_ptr();
  19
  20     a as usize; //~ ERROR casting
  21     //~^ HELP cast through a raw pointer first
  22     b as usize; //~ ERROR non-scalar cast
  23     p as usize;
  24     //~^ ERROR casting
  25     //~^^ HELP cast through a thin pointer
  26
  27     // #22955
  28     q as *const [i32]; //~ ERROR cannot cast
  29
  30     // #21397
  31     let t: *mut (Trait + 'static) = 0 as *mut _; //~ ERROR casting
  32     let mut fail: *const str = 0 as *const str; //~ ERROR casting
  33 }