error[E0277]: `std::rc::Rc<{integer}>` cannot be sent between threads safely --> $DIR/no_send-rc.rs:7:9 | LL | fn bar(_: T) {} | ---- required by this bound in `bar` ... LL | bar(x); | ^ `std::rc::Rc<{integer}>` cannot be sent between threads safely | = help: the trait `std::marker::Send` is not implemented for `std::rc::Rc<{integer}>` error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.