3 #![feature(associated_type_bounds)]
5 #![allow(unused_assignments)]
7 trait Tr1: Copy { type As1: Copy; }
8 trait Tr2: Copy { type As2: Copy; }
9 trait Tr3: Copy { type As3: Copy; }
10 trait Tr4<'a>: Copy { type As4: Copy; }
11 trait Tr5: Copy { type As5: Copy; }
13 impl Tr1 for &str { type As1 = bool; }
14 impl Tr2 for bool { type As2 = u8; }
15 impl Tr3 for u8 { type As3 = fn() -> u8; }
16 impl Tr1 for () { type As1 = (usize,); }
17 impl<'a> Tr4<'a> for (usize,) { type As4 = u8; }
18 impl Tr5 for bool { type As5 = u16; }
20 union Un1<T: Tr1<As1: Tr2>> {
23 inner: <T::As1 as Tr2>::As2,
26 union Un2<T: Tr1<As1: Tr2<As2: Tr3>>> {
29 inner: <T::As1 as Tr2>::As2,
32 union Un3<T: Tr1<As1: 'static>> {
34 outer: &'static T::As1,
37 union Un4<'x1, 'x2, T: Tr1<As1: for<'l> Tr4<'l>>> {
38 f1: &'x1 <T::As1 as Tr4<'x1>>::As4,
39 f2: &'x2 <T::As1 as Tr4<'x2>>::As4,
42 union _Un5<'x1, 'x2, T: Tr1<As1: for<'l> Tr4<'l, As4: Copy>>> {
43 f1: &'x1 <T::As1 as Tr4<'x1>>::As4,
44 f2: &'x2 <T::As1 as Tr4<'x2>>::As4,
49 T: Tr1<As1: Tr2 + 'static + Tr5>,
52 f1: <T::As1 as Tr2>::As2,
54 f3: <T::As1 as Tr5>::As5,
57 union _Un7<'a, 'b, T> // `<T::As1 as Tr2>::As2: 'a` is implied.
62 f1: &'b <T::As1 as Tr2>::As2,
65 unsafe fn _use_un7<'a, 'b, T>(x: _Un7<'a, 'b, T>)
73 #[derive(Copy, Clone)]
74 union UnSelf<T> where Self: Tr1<As1: Tr2>, T: Copy {
76 f1: <Self as Tr1>::As1,
77 f2: <<Self as Tr1>::As1 as Tr2>::As2,
80 impl Tr1 for UnSelf<&'static str> { type As1 = bool; }
83 let mut un1 = Un1 { outest: "foo" };
84 un1 = Un1 { outer: true };
85 assert_eq!(unsafe { un1.outer }, true);
86 un1 = Un1 { inner: 42u8 };
87 assert_eq!(unsafe { un1.inner }, 42u8);
89 let mut un2 = Un2 { outest: "bar" };
90 assert_eq!(unsafe { un2.outest }, "bar");
91 un2 = Un2 { outer: true };
92 assert_eq!(unsafe { un2.outer }, true);
93 un2 = Un2 { inner: 42u8 };
94 assert_eq!(unsafe { un2.inner }, 42u8);
96 let mut un3 = Un3 { outest: "baz" };
97 assert_eq!(unsafe { un3.outest }, "baz");
98 un3 = Un3 { outer: &true };
99 assert_eq!(unsafe { *un3.outer }, true);
103 let mut un4 = Un4::<()> { f1: &f1.0 };
104 assert_eq!(1, unsafe { *un4.f1 });
105 un4 = Un4 { f2: &f2.0 };
106 assert_eq!(2, unsafe { *un4.f2 });
108 let mut un6 = Un6 { f0: "bar" };
109 assert_eq!(unsafe { un6.f0 }, "bar");
110 un6 = Un6 { f1: 24u8 };
111 assert_eq!(unsafe { un6.f1 }, 24u8);
112 un6 = Un6 { f2: &true };
113 assert_eq!(unsafe { un6.f2 }, &true);
114 un6 = Un6 { f3: 12u16 };
115 assert_eq!(unsafe { un6.f3 }, 12u16);
117 let mut unself = UnSelf::<_> { f0: "selfish" };
118 assert_eq!(unsafe { unself.f0 }, "selfish");
119 unself = UnSelf { f1: true };
120 assert_eq!(unsafe { unself.f1 }, true);
121 unself = UnSelf { f2: 24u8 };
122 assert_eq!(unsafe { unself.f2 }, 24u8);