error[E0277]: `std::rc::Rc<std::cell::Cell<i32>>` cannot be sent between threads safely
  --> $DIR/auto-trait-leak2.rs:25:5
   |
LL |     send(before());
   |     ^^^^ `std::rc::Rc<std::cell::Cell<i32>>` cannot be sent between threads safely
   |
   = help: within `impl std::ops::Fn<(i32,)>`, the trait `std::marker::Send` is not implemented for `std::rc::Rc<std::cell::Cell<i32>>`
   = note: required because it appears within the type `[closure@$DIR/auto-trait-leak2.rs:19:5: 19:22 p:std::rc::Rc<std::cell::Cell<i32>>]`
   = note: required because it appears within the type `impl std::ops::Fn<(i32,)>`
note: required by `send`
  --> $DIR/auto-trait-leak2.rs:22:1
   |
LL | fn send<T: Send>(_: T) {}
   | ^^^^^^^^^^^^^^^^^^^^^^

error[E0277]: `std::rc::Rc<std::cell::Cell<i32>>` cannot be sent between threads safely
  --> $DIR/auto-trait-leak2.rs:28:5
   |
LL |     send(after());
   |     ^^^^ `std::rc::Rc<std::cell::Cell<i32>>` cannot be sent between threads safely
   |
   = help: within `impl std::ops::Fn<(i32,)>`, the trait `std::marker::Send` is not implemented for `std::rc::Rc<std::cell::Cell<i32>>`
   = note: required because it appears within the type `[closure@$DIR/auto-trait-leak2.rs:36:5: 36:22 p:std::rc::Rc<std::cell::Cell<i32>>]`
   = note: required because it appears within the type `impl std::ops::Fn<(i32,)>`
note: required by `send`
  --> $DIR/auto-trait-leak2.rs:22:1
   |
LL | fn send<T: Send>(_: T) {}
   | ^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors

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