The error is arising because
par :: a -> b -> b
thus
yield (processBlockList emptyBS bl)
could be in any monad at all. Note that nothing will actually be yielded
by the do-block as you defined it, even if we added a signature. What you
seem to be envisaging there, though, would involve simultaneous calculation
of elements across the whole length of the initial pipe or rather producer.
That would conflict with its being a regular producer, but I will try to
piece together more of what you are saying, there's still something I don't
get.
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