src/test/ui/bare-fn-implements-fn-mut.rs

   1 // run-pass
   2
   3 use std::ops::FnMut;
   4
   5 fn call_f<F:FnMut()>(mut f: F) {
   6     f();
   7 }
   8
   9 fn f() {
  10     println!("hello");
  11 }
  12
  13 fn call_g<G:FnMut(String,String) -> String>(mut g: G, x: String, y: String)
  14           -> String {
  15     g(x, y)
  16 }
  17
  18 fn g(mut x: String, y: String) -> String {
  19     x.push_str(&y);
  20     x
  21 }
  22
  23 fn main() {
  24     call_f(f);
  25     assert_eq!(call_g(g, "foo".to_string(), "bar".to_string()),
  26                "foobar");
  27 }