src/test/run-pass/traits/trait-inheritance-subst2.rs

   1 // run-pass
   2
   3 trait Panda<T> {
   4     fn chomp(&self, bamboo: &T) -> T;
   5 }
   6
   7 trait Add<RHS,Result>: Panda<RHS> {
   8     fn add(&self, rhs: &RHS) -> Result;
   9 }
  10
  11 trait MyNum : Sized + Add<Self,Self> { }
  12
  13 struct MyInt { val: isize }
  14
  15 impl Panda<MyInt> for MyInt {
  16     fn chomp(&self, bamboo: &MyInt) -> MyInt {
  17         mi(self.val + bamboo.val)
  18     }
  19 }
  20
  21 impl Add<MyInt, MyInt> for MyInt {
  22     fn add(&self, other: &MyInt) -> MyInt { self.chomp(other) }
  23 }
  24
  25 impl MyNum for MyInt {}
  26
  27 fn f<T:MyNum>(x: T, y: T) -> T {
  28     return x.add(&y).chomp(&y);
  29 }
  30
  31 fn mi(v: isize) -> MyInt { MyInt { val: v } }
  32
  33 pub fn main() {
  34     let (x, y) = (mi(3), mi(5));
  35     let z = f(x, y);
  36     assert_eq!(z.val, 13);
  37 }