src/test/ui/tuple/builtin.rs

   1 // check-pass
   2
   3 #![feature(tuple_trait)]
   4
   5 fn assert_is_tuple<T: std::marker::Tuple + ?Sized>() {}
   6
   7 struct Unsized([u8]);
   8
   9 fn from_param_env<T: std::marker::Tuple + ?Sized>() {
  10     assert_is_tuple::<T>();
  11 }
  12
  13 fn main() {
  14     assert_is_tuple::<()>();
  15     assert_is_tuple::<(i32,)>();
  16     assert_is_tuple::<(Unsized,)>();
  17     from_param_env::<()>();
  18     from_param_env::<(i32,)>();
  19     from_param_env::<(Unsized,)>();
  20 }