| // Regression test for HashMap only impl'ing Send/Sync if its contents do | |
| use std::collections::HashMap; | |
| use std::rc::Rc; | |
| fn foo<T: Send>() {} | |
| fn main() { | |
| foo::<HashMap<Rc<()>, Rc<()>>>(); | |
| //~^ ERROR `std::rc::Rc<()>` cannot be sent between threads safely | |
| } |