error[E0277]: `Rc<{integer}>` cannot be sent between threads safely --> $DIR/no_send-rc.rs:7:9 | LL | bar(x); | --- ^ `Rc<{integer}>` cannot be sent between threads safely | | | required by a bound introduced by this call | = help: the trait `Send` is not implemented for `Rc<{integer}>` note: required by a bound in `bar` --> $DIR/no_send-rc.rs:3:11 | LL | fn bar(_: T) {} | ^^^^ required by this bound in `bar` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0277`.