rust-clippy/tests/ui/future_not_send.stderr

error: future cannot be sent between threads safely
  --> $DIR/future_not_send.rs:7:1
   |
LL | async fn private_future(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `private_future` is not `Send`
   |
note: future is not `Send` as this value is used across an await
  --> $DIR/future_not_send.rs:9:20
   |
LL | async fn private_future(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                         -- has type `std::rc::Rc<[u8]>` which is not `Send`
LL |
LL |     async { true }.await
   |                    ^^^^^ await occurs here, with `rc` maybe used later
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Send`
note: captured value is not `Send` because `&` references cannot be sent unless their referent is `Sync`
  --> $DIR/future_not_send.rs:7:39
   |
LL | async fn private_future(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                                       ^^^^ has type `&std::cell::Cell<usize>` which is not `Send`, because `std::cell::Cell<usize>` is not `Sync`
   = note: `std::cell::Cell<usize>` doesn't implement `std::marker::Sync`
   = note: `-D clippy::future-not-send` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::future_not_send)]`

error: future cannot be sent between threads safely
  --> $DIR/future_not_send.rs:12:1
   |
LL | pub async fn public_future(rc: Rc<[u8]>) {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `public_future` is not `Send`
   |
note: future is not `Send` as this value is used across an await
  --> $DIR/future_not_send.rs:14:20
   |
LL | pub async fn public_future(rc: Rc<[u8]>) {
   |                            -- has type `std::rc::Rc<[u8]>` which is not `Send`
LL |
LL |     async { true }.await;
   |                    ^^^^^ await occurs here, with `rc` maybe used later
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Send`

error: future cannot be sent between threads safely
  --> $DIR/future_not_send.rs:21:1
   |
LL | async fn private_future2(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `private_future2` is not `Send`
   |
note: captured value is not `Send`
  --> $DIR/future_not_send.rs:21:26
   |
LL | async fn private_future2(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                          ^^ has type `std::rc::Rc<[u8]>` which is not `Send`
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Send`
note: captured value is not `Send` because `&` references cannot be sent unless their referent is `Sync`
  --> $DIR/future_not_send.rs:21:40
   |
LL | async fn private_future2(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                                        ^^^^ has type `&std::cell::Cell<usize>` which is not `Send`, because `std::cell::Cell<usize>` is not `Sync`
   = note: `std::cell::Cell<usize>` doesn't implement `std::marker::Sync`

error: future cannot be sent between threads safely
  --> $DIR/future_not_send.rs:26:1
   |
LL | pub async fn public_future2(rc: Rc<[u8]>) {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `public_future2` is not `Send`
   |
note: captured value is not `Send`
  --> $DIR/future_not_send.rs:26:29
   |
LL | pub async fn public_future2(rc: Rc<[u8]>) {}
   |                             ^^ has type `std::rc::Rc<[u8]>` which is not `Send`
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Send`

error: future cannot be sent between threads safely
  --> $DIR/future_not_send.rs:38:5
   |
LL |     async fn private_future(&self) -> usize {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `private_future` is not `Send`
   |
note: future is not `Send` as this value is used across an await
  --> $DIR/future_not_send.rs:40:24
   |
LL |     async fn private_future(&self) -> usize {
   |                             ----- has type `&Dummy` which is not `Send`
LL |
LL |         async { true }.await;
   |                        ^^^^^ await occurs here, with `&self` maybe used later
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Sync`

error: future cannot be sent between threads safely
  --> $DIR/future_not_send.rs:44:5
   |
LL |     pub async fn public_future(&self) {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `public_future` is not `Send`
   |
note: captured value is not `Send` because `&` references cannot be sent unless their referent is `Sync`
  --> $DIR/future_not_send.rs:44:32
   |
LL |     pub async fn public_future(&self) {
   |                                ^^^^^ has type `&Dummy` which is not `Send`, because `Dummy` is not `Sync`
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Sync`

error: future cannot be sent between threads safely
  --> $DIR/future_not_send.rs:55:1
   |
LL | / async fn generic_future<T>(t: T) -> T
LL | |
LL | | where
LL | |     T: Send,
   | |____________^ future returned by `generic_future` is not `Send`
   |
note: future is not `Send` as this value is used across an await
  --> $DIR/future_not_send.rs:61:20
   |
LL |     let rt = &t;
   |         -- has type `&T` which is not `Send`
LL |     async { true }.await;
   |                    ^^^^^ await occurs here, with `rt` maybe used later
   = note: `T` doesn't implement `std::marker::Sync`

error: future cannot be sent between threads safely
  --> $DIR/future_not_send.rs:73:1
   |
LL | async fn unclear_future<T>(t: T) {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `unclear_future` is not `Send`
   |
note: captured value is not `Send`
  --> $DIR/future_not_send.rs:73:28
   |
LL | async fn unclear_future<T>(t: T) {}
   |                            ^ has type `T` which is not `Send`
   = note: `T` doesn't implement `std::marker::Send`

error: aborting due to 8 previous errors