src/test/compile-fail/variance-issue-20533.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 // Regression test for issue #20533. At some point, only 1 out of the
  12 // 3 errors below were being reported.
  13
  14 use std::marker::PhantomData;
  15
  16 fn foo<'a, T>(_x: &'a T) -> PhantomData<&'a ()> {
  17     PhantomData
  18 }
  19
  20 struct Wrap<T>(T);
  21
  22 fn bar<'a, T>(_x: &'a T) -> Wrap<PhantomData<&'a ()>> {
  23     Wrap(PhantomData)
  24 }
  25
  26 struct Baked<'a>(PhantomData<&'a ()>);
  27
  28 fn baz<'a, T>(_x: &'a T) -> Baked<'a> {
  29     Baked(PhantomData)
  30 }
  31
  32 struct AffineU32(u32);
  33
  34 fn main() {
  35     {
  36         let a = AffineU32(1);
  37         let x = foo(&a);
  38         drop(a); //~ ERROR cannot move out of `a`
  39         drop(x);
  40     }
  41     {
  42         let a = AffineU32(1);
  43         let x = bar(&a);
  44         drop(a); //~ ERROR cannot move out of `a`
  45         drop(x);
  46     }
  47     {
  48         let a = AffineU32(1);
  49         let x = baz(&a);
  50         drop(a); //~ ERROR cannot move out of `a`
  51         drop(x);
  52     }
  53 }