src/test/compile-fail/dst-bad-coerce1.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 // Attempt to change the type as well as unsizing.
  12
  13 struct Fat<T: ?Sized> {
  14     ptr: T
  15 }
  16
  17 struct Foo;
  18 trait Bar { fn bar(&self) {} }
  19
  20 pub fn main() {
  21     // With a vec of isize.
  22     let f1 = Fat { ptr: [1, 2, 3] };
  23     let f2: &Fat<[isize; 3]> = &f1;
  24     let f3: &Fat<[usize]> = f2;
  25     //~^ ERROR mismatched types
  26
  27     // With a trait.
  28     let f1 = Fat { ptr: Foo };
  29     let f2: &Fat<Foo> = &f1;
  30     let f3: &Fat<Bar> = f2;
  31     //~^ ERROR `Foo: Bar` is not satisfied
  32 }