error[E0277]: `NoSend` cannot be sent between threads safely --> $DIR/no_send-enum.rs:16:9 | LL | bar(x); | --- ^ `NoSend` cannot be sent between threads safely | | | required by a bound introduced by this call | = help: within `Foo`, the trait `Send` is not implemented for `NoSend`, which is required by `Foo: Send` note: required because it appears within the type `Foo` --> $DIR/no_send-enum.rs:8:6 | LL | enum Foo { | ^^^ note: required by a bound in `bar` --> $DIR/no_send-enum.rs:12:11 | 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`.