src/test/ui/overloaded/overloaded-calls-param-vtables.rs

   1 // run-pass
   2 // Tests that nested vtables work with overloaded calls.
   3
   4 // pretty-expanded FIXME #23616
   5
   6 #![feature(unboxed_closures, fn_traits)]
   7
   8 use std::marker::PhantomData;
   9 use std::ops::Fn;
  10 use std::ops::Add;
  11
  12 struct G<A>(PhantomData<A>);
  13
  14 impl<'a, A: Add<i32, Output=i32>> Fn<(A,)> for G<A> {
  15     extern "rust-call" fn call(&self, (arg,): (A,)) -> i32 {
  16         arg.add(1)
  17     }
  18 }
  19
  20 impl<'a, A: Add<i32, Output=i32>> FnMut<(A,)> for G<A> {
  21     extern "rust-call" fn call_mut(&mut self, args: (A,)) -> i32 { self.call(args) }
  22 }
  23
  24 impl<'a, A: Add<i32, Output=i32>> FnOnce<(A,)> for G<A> {
  25     type Output = i32;
  26     extern "rust-call" fn call_once(self, args: (A,)) -> i32 { self.call(args) }
  27 }
  28
  29 fn main() {
  30     // ICE trigger
  31     (G(PhantomData))(1);
  32 }