| fn mainIterator<_ = _> {} |
| //~^ ERROR expected identifier, found reserved identifier `_` |
| //~| ERROR missing parameters for function definition |
| //~| ERROR defaults for type parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions [invalid_type_param_default] |
| //~| WARNING this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! |
| //~| ERROR the placeholder `_` is not allowed within types on item signatures for functions [E0121] |
| |
| fn main() {} |
