pool: use Executor
trait instead of concrete type
#47
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Alternative to #24.
Currently,
Pool
cannot be used at all. It requires a concreteExec
, and that is private. The #24 PR simply madeExec
public. However, there is already other things in this crate that require anExec
(legacy::Client
).This adapts
Pool
to follow the same pattern as used forClient
, taking in a trait.This change is NOT a breaking change, as
Pool
cannot be used at all currently, so no one could be broken.