src/test/compile-fail/phantom-oibit.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 // Ensure that OIBIT checks `T` when it encounters a `PhantomData<T>` field, instead of checking
  12 // the `PhantomData<T>` type itself (which almost always implements a "default" trait
  13 // (`impl Trait for ..`))
  14
  15 #![feature(optin_builtin_traits)]
  16
  17 use std::marker::{PhantomData};
  18
  19 unsafe trait Zen {}
  20
  21 unsafe impl Zen for .. {}
  22
  23 unsafe impl<'a, T: 'a> Zen for &'a T where T: Sync {}
  24
  25 struct Guard<'a, T: 'a> {
  26     _marker: PhantomData<&'a T>,
  27 }
  28
  29 struct Nested<T>(T);
  30
  31 fn is_zen<T: Zen>(_: T) {}
  32
  33 fn not_sync<T>(x: Guard<T>) {
  34     is_zen(x)  //~ error: `T: std::marker::Sync` is not satisfied
  35 }
  36
  37 fn nested_not_sync<T>(x: Nested<Guard<T>>) {
  38     is_zen(x)  //~ error: `T: std::marker::Sync` is not satisfied
  39 }
  40
  41 fn main() {}