| fn mainIterator<_ = _> {} | |
| //~^ ERROR expected identifier, found reserved identifier `_` | |
| //~| ERROR missing parameters for function definition | |
| //~| ERROR defaults for generic parameters are not allowed here [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() {} |