error[E0277]: `NoSend` cannot be sent between threads safely --> $DIR/no_send-enum.rs:16:5 | LL | bar(x); | ^^^ `NoSend` cannot be sent between threads safely | = help: within `Foo`, the trait `std::marker::Send` is not implemented for `NoSend` = note: required because it appears within the type `Foo` note: required by `bar` --> $DIR/no_send-enum.rs:12:1 | LL | fn bar(_: T) {} | ^^^^^^^^^^^^^^^^^^^^^ error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.