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0e5d5c9fda
This is the prerequisite for making `SourceKitServer` an actor, which will mean that the `handle` methods will be `async`. The current paradigm of returning from `handle` once we can guarantee that there’s no out-of-order execution and then returning the actual result via the callback that’s attached to `Request` is a little weird still. I am hoping to change this paradigm to return the actual result and have a callback function that `handle` can call to indicate that it’s ready to accept another message while guaranteeing in-order execution, essentially flipping the role of the return value and the closure callback. But that’s something to be done after the entire stack has been asyncificied.