tests/ui/traits/issue-78632.rs

   1 // check-pass
   2 //
   3 // Regression test for issue #78632
   4
   5 #![crate_type = "lib"]
   6
   7 pub trait Corge<T> {
   8     type Fred;
   9 }
  10
  11 impl Corge<u8> for () {
  12     type Fred = u32;
  13 }
  14
  15 pub trait Waldo {
  16     type Quax;
  17 }
  18
  19 impl Waldo for u32 {
  20     type Quax = u8;
  21 }
  22
  23 pub trait Grault
  24 where
  25     (): Corge<Self::Thud>,
  26 {
  27     type Thud;
  28     fn bar(_: <() as Corge<Self::Thud>>::Fred) {}
  29 }
  30
  31 impl<T> Grault for T
  32 where
  33     T: Waldo,
  34     (): Corge<T::Quax>,
  35     <() as Corge<T::Quax>>::Fred: Waldo,
  36 {
  37     type Thud = u8;
  38 }
  39
  40 pub trait Plugh<I> {
  41     fn baz();
  42 }
  43
  44 #[derive(Copy, Clone, Debug)]
  45 pub struct Qiz<T> {
  46     foo: T,
  47 }
  48
  49 impl<T> Plugh<<() as Corge<T::Thud>>::Fred> for Qiz<T>
  50 where
  51     T: Grault,
  52     (): Corge<T::Thud>,
  53 {
  54     fn baz() {}
  55 }
  56
  57 pub fn test() {
  58     <Qiz<u32> as Plugh<u32>>::baz();
  59 }