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flush_next_out 

        # Zlib::ZStream.flush_next_out

(from ruby core)
### Implementation from ZStream
---
    flush_next_out                 -> String
    flush_next_out { |chunk| ... } -> nil

---

Flushes output buffer and returns all data in that buffer.  If a block
is given each chunk is yielded to the block until the current output
buffer has been flushed.

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