src/test/ui/associated-type-bounds/enum-bounds.rs

   1 // run-pass
   2
   3 #![feature(associated_type_bounds)]
   4
   5 trait Tr1 { type As1; }
   6 trait Tr2 { type As2; }
   7 trait Tr3 { type As3; }
   8 trait Tr4<'a> { type As4; }
   9 trait Tr5 { type As5; }
  10
  11 impl Tr1 for &str { type As1 = bool; }
  12 impl Tr2 for bool { type As2 = u8; }
  13 impl Tr3 for u8 { type As3 = fn() -> u8; }
  14 impl Tr1 for () { type As1 = (usize,); }
  15 impl<'a> Tr4<'a> for (usize,) { type As4 = u8; }
  16 impl Tr5 for bool { type As5 = u16; }
  17
  18 enum En1<T: Tr1<As1: Tr2>> {
  19     Outest(T),
  20     Outer(T::As1),
  21     Inner(<T::As1 as Tr2>::As2),
  22 }
  23
  24 fn wrap_en1_1<T>(x: T) -> En1<T> where T: Tr1, T::As1: Tr2 {
  25     En1::Outest(x)
  26 }
  27
  28 fn wrap_en1_2<T>(x: T::As1) -> En1<T> where T: Tr1, T::As1: Tr2 {
  29     En1::Outer(x)
  30 }
  31
  32 fn wrap_en1_3<T>(x: <T::As1 as Tr2>::As2) -> En1<T> where T: Tr1, T::As1: Tr2 {
  33     En1::Inner(x)
  34 }
  35
  36 enum En2<T: Tr1<As1: Tr2<As2: Tr3>>> {
  37     V0(T),
  38     V1(T::As1),
  39     V2(<T::As1 as Tr2>::As2),
  40     V3(<<T::As1 as Tr2>::As2 as Tr3>::As3),
  41 }
  42
  43 enum En3<T: Tr1<As1: 'static>> {
  44     V0(T),
  45     V1(&'static T::As1),
  46 }
  47
  48 enum En4<'x1, 'x2, T: Tr1<As1: for<'l> Tr4<'l>>> {
  49     V0(&'x1 <T::As1 as Tr4<'x1>>::As4),
  50     V1(&'x2 <T::As1 as Tr4<'x2>>::As4),
  51 }
  52
  53 enum _En5<'x1, 'x2, T: Tr1<As1: for<'l> Tr4<'l, As4: Copy>>> {
  54     _V0(&'x1 <T::As1 as Tr4<'x1>>::As4),
  55     _V1(&'x2 <T::As1 as Tr4<'x2>>::As4),
  56 }
  57
  58 enum En6<T>
  59 where
  60     T: Tr1<As1: Tr2 + 'static + Tr5>,
  61 {
  62     V0(T),
  63     V1(<T::As1 as Tr2>::As2),
  64     V2(&'static T::As1),
  65     V3(<T::As1 as Tr5>::As5),
  66 }
  67
  68 enum _En7<'a, 'b, T> // `<T::As1 as Tr2>::As2: 'a` is implied.
  69 where
  70     T: Tr1<As1: Tr2>,
  71 {
  72     V0(&'a T),
  73     V1(&'b <T::As1 as Tr2>::As2),
  74 }
  75
  76 fn _make_en7<'a, 'b, T>(x: _En7<'a, 'b, T>)
  77 where
  78     T: Tr1<As1: Tr2>,
  79 {
  80     match x {
  81         _En7::V0(x) => {
  82             let _: &'a T = &x;
  83         },
  84         _En7::V1(_) => {},
  85     }
  86 }
  87
  88 enum EnSelf<T> where Self: Tr1<As1: Tr2> {
  89     V0(T),
  90     V1(<Self as Tr1>::As1),
  91     V2(<<Self as Tr1>::As1 as Tr2>::As2),
  92 }
  93
  94 impl Tr1 for EnSelf<&'static str> { type As1 = bool; }
  95
  96 fn main() {
  97     if let En1::Outest("foo") = wrap_en1_1::<_>("foo") {} else { panic!() };
  98     if let En1::Outer(true) = wrap_en1_2::<&str>(true) {} else { panic!() };
  99     if let En1::Inner(24u8) = wrap_en1_3::<&str>(24u8) {} else { panic!() };
 100
 101     let _ = En2::<_>::V0("151571");
 102     let _ = En2::<&str>::V1(false);
 103     let _ = En2::<&str>::V2(42u8);
 104     let _ = En2::<&str>::V3(|| 12u8);
 105
 106     let _ = En3::<_>::V0("deadbeef");
 107     let _ = En3::<&str>::V1(&true);
 108
 109     let f1 = (1,);
 110     let f2 = (2,);
 111     let _ = En4::<()>::V0(&f1.0);
 112     let _ = En4::<()>::V1(&f2.0);
 113
 114     let _ = En6::<_>::V0("bar");
 115     let _ = En6::<&str>::V1(24u8);
 116     let _ = En6::<&str>::V2(&false);
 117     let _ = En6::<&str>::V3(12u16);
 118
 119     let _ = EnSelf::<_>::V0("foo");
 120     let _ = EnSelf::<&'static str>::V1(true);
 121     let _ = EnSelf::<&'static str>::V2(24u8);
 122 }