How to iterate `dyn Future`

Question

I have

futures: Vec<Box<dyn Future<Output = PendingTransaction<'a, ()>>>>,
...
let (res, idx, remaining_futures) = block_on(select_all(self.futures.into_iter().map(|x| &*x)));

It does not compile:

   Compiling server v0.1.0 (/home/porton/Projects/ubi-russia/private/server)
error[E0277]: the trait bound `&dyn core::future::future::Future<Output = ethers_providers::pending_transaction::PendingTransaction<'_, ()>>: core::future::future::Future` is not satisfied
   --> src/transactions.rs:102:73
    |
102 |                 let (res, idx, remaining_futures) = block_on(select_all(self.futures.into_iter().map(|x| &*x)));
    |                                                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `core::future::future::Future` is not implemented for `&dyn core::future::future::Future<Output = ethers_providers::pending_transaction::PendingTransaction<'_, ()>>`
    | 
   ::: /home/porton/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.5/src/future/select_all.rs:35:20
    |
35  |           I::Item: Future + Unpin,
    |                    ------ required by this bound in `futures_util::future::select_all::select_all`

How to do this correctly?

@AlexLarionov It does not work because `Box<...>` is not a `Future`. — porton, Sep 05 '20 at 16:36
Do you pin the futures? Because `Box` is a `Future` if the content is `Unpin`. Look an [this answer](https://stackoverflow.com/a/60562303/8564999) — Alexey Larionov, Sep 05 '20 at 16:39

How to iterate `dyn Future`

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