src/test/compile-fail/unboxed-closure-sugar-equiv.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 // Test that the unboxed closure sugar can be used with an arbitrary
  12 // struct type and that it is equivalent to the same syntax using
  13 // angle brackets. This test covers only simple types and in
  14 // particular doesn't test bound regions.
  15
  16 #![feature(unboxed_closures)]
  17 #![allow(dead_code)]
  18
  19 trait Foo<T,U> {
  20     fn dummy(&self, t: T, u: U);
  21 }
  22
  23 trait Eq<X: ?Sized> { }
  24 impl<X: ?Sized> Eq<X> for X { }
  25 fn eq<A: ?Sized,B: ?Sized +Eq<A>>() { }
  26
  27 fn test<'a,'b>() {
  28     // No errors expected:
  29     eq::< Foo<(),()>,                   Foo()                         >();
  30     eq::< Foo<(isize,),()>,               Foo(isize)                      >();
  31     eq::< Foo<(isize,usize),()>,           Foo(isize,usize)                 >();
  32     eq::< Foo<(isize,usize),usize>,         Foo(isize,usize) -> usize         >();
  33     eq::< Foo<(&'a isize,&'b usize),usize>, Foo(&'a isize,&'b usize) -> usize >();
  34
  35     // Test that anonymous regions in `()` form are equivalent
  36     // to fresh bound regions, and that we can intermingle
  37     // named and anonymous as we choose:
  38     eq::< for<'x,'y> Foo<(&'x isize,&'y usize),usize>,
  39           for<'x,'y> Foo(&'x isize,&'y usize) -> usize            >();
  40     eq::< for<'x,'y> Foo<(&'x isize,&'y usize),usize>,
  41           for<'x> Foo(&'x isize,&usize) -> usize                  >();
  42     eq::< for<'x,'y> Foo<(&'x isize,&'y usize),usize>,
  43           for<'y> Foo(&isize,&'y usize) -> usize                  >();
  44     eq::< for<'x,'y> Foo<(&'x isize,&'y usize),usize>,
  45           Foo(&isize,&usize) -> usize                             >();
  46
  47     // lifetime elision
  48     eq::< for<'x> Foo<(&'x isize,), &'x isize>,
  49           Foo(&isize) -> &isize                                   >();
  50
  51     // Errors expected:
  52     eq::< Foo<(),()>,                   Foo(char)                     >();
  53     //~^ ERROR not implemented
  54 }
  55
  56 fn main() { }