src/test/ui/iterators/iter-cloned-type-inference.rs

   1 // run-pass
   2 #![allow(stable_features)]
   3
   4 // Test to see that the element type of .cloned() can be inferred
   5 // properly. Previously this would fail to deduce the type of `sum`.
   6
   7 #![feature(iter_arith)]
   8
   9 fn square_sum(v: &[i64]) -> i64 {
  10     let sum: i64 = v.iter().cloned().sum();
  11     sum * sum
  12 }
  13
  14 fn main() {
  15     assert_eq!(36, square_sum(&[1,2,3]));
  16 }