until -package:numeric-prelude -package:streaming -package:util -package:foundation -package:LambdaHack package:scalpel-core

Create a new serial context by moving the focus backward and collecting nodes until the scraper matches the focused node. The serial scraper is then executed on the collected nodes.
Create a new serial context by moving the focus forward and collecting nodes until the scraper matches the focused node. The serial scraper is then executed on the collected nodes. The provided serial scraper is unable to see nodes outside the new restricted context.