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The result of a call, which may not have arrived yet. It can be used to pipeline calls to capabilities that we hope will be returned in the results.
method when_resolved : (Wire.Response.t or_error -> unit) -> unit
r#when_resolved fn queues up
fn to be called on the result, when it arrives. If the result has already arrived,
fn is called immediately.
method response : Wire.Response.t or_error option
Some payload if the response has arrived, or
None if we're still waiting.
method cap : Wire.Path.t -> cap
r#cap path is the capability found at
path in the response. If the response has arrived, this will extract the capability from it. If not, it may create a capability that will pipeline through the promised answer until the result arrives (at which point it will use the new, more direct route). The caller should call
cap#dec_ref when done.