Separating

A response chain can be separated and transformed to a Response property for each of the responses in the chain. A Response-observer can be built easily by adding the corresponding label referring to the response (r). The current state has to be matched, if in the old observer, the scope was closed, or no pending requests were open, or the error state was reached, the state can be mapped directly. Otherwise, if (p) had already occurred, the new observer should be set to state open, otherwise to state waiting.