How do I change the Rx Builder implementation to fix the stack overflow exception?

Question

I\'m trying to come up with an Rx Builder to use Reactive Extension within the F# Computation Expression syntax. How do I fix it so that it doesnt blow the stack? Like the Seq e

Answer 1

Notice this has been fixed in Rx v2.0 (as mentioned here already), more generally for all of the sequencing operators (Concat, Catch, OnErrorResumeNext), as well as the imperative operators (If, While, etc.).

Basically, you can think of this class of operators as doing a subscribe to another sequence in a terminal observer message (e.g. Concat subscribes to the next sequence upon receiving the current one's OnCompleted message), which is where the tail recursion analogy comes in.

In Rx v2.0, all of the tail-recursive subscriptions are flattened into a queue-like data structure for processing one at a time, talking to the downstream observer. This avoids the unbounded growth of observers talking to each other for successive sequence subscriptions.