src/test/compile-fail/unsized-enum.rs

   1 // Copyright 2012 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
  12 fn is_sized<T:Sized>() { }
  13 fn not_sized<T: ?Sized>() { }
  14
  15 enum Foo<U> { FooSome(U), FooNone }
  16 fn foo1<T>() { not_sized::<Foo<T>>() } // Hunky dory.
  17 fn foo2<T: ?Sized>() { not_sized::<Foo<T>>() }
  18 //~^ ERROR `T: std::marker::Sized` is not satisfied
  19 //
  20 // Not OK: `T` is not sized.
  21
  22 enum Bar<U: ?Sized> { BarSome(U), BarNone }
  23 fn bar1<T: ?Sized>() { not_sized::<Bar<T>>() }
  24 fn bar2<T: ?Sized>() { is_sized::<Bar<T>>() }
  25 //~^ ERROR `T: std::marker::Sized` is not satisfied
  26 //
  27 // Not OK: `Bar<T>` is not sized, but it should be.
  28
  29 fn main() { }