src/test/ui/traits/issue-6334.rs

   1 // run-pass
   2 // Tests that everything still compiles and runs fine even when
   3 // we reorder the bounds.
   4
   5
   6 trait A {
   7     fn a(&self) -> usize;
   8 }
   9
  10 trait B {
  11     fn b(&self) -> usize;
  12 }
  13
  14 trait C {
  15     fn combine<T:A+B>(&self, t: &T) -> usize;
  16 }
  17
  18 struct Foo;
  19
  20 impl A for Foo {
  21     fn a(&self) -> usize { 1 }
  22 }
  23
  24 impl B for Foo {
  25     fn b(&self) -> usize { 2 }
  26 }
  27
  28 struct Bar;
  29
  30 impl C for Bar {
  31     // Note below: bounds in impl decl are in reverse order.
  32     fn combine<T:B+A>(&self, t: &T) -> usize {
  33         (t.a() * 100) + t.b()
  34     }
  35 }
  36
  37 fn use_c<S:C, T:B+A>(s: &S, t: &T) -> usize {
  38     s.combine(t)
  39 }
  40
  41 pub fn main() {
  42     let foo = Foo;
  43     let bar = Bar;
  44     let r = use_c(&bar, &foo);
  45     assert_eq!(r, 102);
  46 }