error[E0277]: `NoSend` cannot be sent between threads safely
  --> $DIR/no_send-enum.rs:16:5
   |
LL | fn bar<T: Send>(_: T) {}
   | --------------------- required by `bar`
...
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`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.