error: future cannot be sent between threads safely
  --> $DIR/ice-5207.rs:6:35
   |
LL | pub async fn bar<'a, T: 'a>(_: T) {}
   |                                   ^ future returned by `bar` is not `Send`
   |
note: captured value is not `Send`
  --> $DIR/ice-5207.rs:6:29
   |
LL | pub async fn bar<'a, T: 'a>(_: T) {}
   |                             ^ has type `T` which is not `Send`
   = note: `T` doesn't implement `std::marker::Send`
   = note: `-D clippy::future-not-send` implied by `-D warnings`

error: aborting due to previous error