4 #![feature(associated_type_bounds)]
6 trait Tr1 { type As1; }
7 trait Tr2 { type As2; }
9 trait Tr4<'a> { type As4; }
10 trait Tr5 { type As5; }
12 impl Tr1 for &str { type As1 = bool; }
13 impl Tr2 for bool { type As2 = u8; }
15 impl Tr1 for () { type As1 = (usize,); }
16 impl<'a> Tr4<'a> for (usize,) { type As4 = u8; }
17 impl Tr5 for bool { type As5 = u16; }
19 struct St1<T: Tr1<As1: Tr2>> {
22 inner: <T::As1 as Tr2>::As2,
25 fn unwrap_1_st1<T: Tr1<As1: Tr2>>(x: St1<T>) -> (T, T::As1, <T::As1 as Tr2>::As2) {
26 (x.outest, x.outer, x.inner)
29 fn unwrap_2_st1<T>(x: St1<T>) -> (T, T::As1, <T::As1 as Tr2>::As2)
37 struct St2<T: Tr1<As1: Tr2<As2: Tr3>>> {
40 inner: <T::As1 as Tr2>::As2,
43 struct St3<T: Tr1<As1: 'static>> {
45 outer: &'static T::As1,
48 struct St4<'x1, 'x2, T: Tr1<As1: for<'l> Tr4<'l>>> {
49 f1: &'x1 <T::As1 as Tr4<'x1>>::As4,
50 f2: &'x2 <T::As1 as Tr4<'x2>>::As4,
53 struct St5<'x1, 'x2, T: Tr1<As1: for<'l> Tr4<'l, As4: Copy>>> {
54 f1: &'x1 <T::As1 as Tr4<'x1>>::As4,
55 f2: &'x2 <T::As1 as Tr4<'x2>>::As4,
60 T: Tr1<As1: Tr2 + 'static + Tr5>,
63 f1: <T::As1 as Tr2>::As2,
65 f3: <T::As1 as Tr5>::As5,
68 struct St7<'a, 'b, T> // `<T::As1 as Tr2>::As2: 'a` is implied.
73 f1: &'b <T::As1 as Tr2>::As2,
76 fn _use_st7<'a, 'b, T>(x: St7<'a, 'b, T>)
84 struct StSelf<T> where Self: Tr1<As1: Tr2> {
85 f2: <<Self as Tr1>::As1 as Tr2>::As2,
88 impl Tr1 for StSelf<&'static str> { type As1 = bool; }
91 let st1 = St1 { outest: "foo", outer: true, inner: 42u8 };
92 assert_eq!(("foo", true, 42), unwrap_1_st1(st1));
94 let _ = St2 { outest: "foo", outer: true, inner: 42u8 };
96 let _ = St3 { outest: "foo", outer: &true };
100 let st4 = St4::<()> { f1: &f1.0, f2: &f2.0, };
101 assert_eq!((&1, &2), (st4.f1, st4.f2));
103 // FIXME: requires lazy normalization.
107 let st5 = St5::<()> { f1: &f1.0, f2: &f2.0, };
108 assert_eq!((&1, &2), (st5.f1, st5.f2));
111 let st6 = St6 { f0: "bar", f1: 24u8, f2: &true, f3: 12u16, };
112 assert_eq!(("bar", 24, &true, 12), (st6.f0, st6.f1, st6.f2, st6.f3));
114 let stself = StSelf::<&'static str> { f2: 42u8 };
115 assert_eq!(stself.f2, 42u8);