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getTimelineHistory() is called twice, to read the source and the target timeline history files. However, the loop to print the file with the --debug option used the wrong variable when dealing with the source. As a result, the source's history was always printed as empty. Spotted while debugging bug #18575, but this does not fix that bug, just the debugging output. Backpatch to all supported versions. Discussion: https://www.postgresql.org/message-id/092dd515-b7b4-4fd0-8407-ceca2f02f6ec@iki.fi