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Program repair research has made tremendous progress over the last few years,and software development bots are now being invented to help developers gainproductivity. In this paper, we investigate the concept of a " program repairbot " and present Repairnator. The Repairnator bot is an autonomous agent thatconstantly monitors test failures, reproduces bugs, and runs program repairtools against each reproduced bug. If a patch is found, Repairnator bot reportsit to the developers. At the time of writing, Repairnator uses three differentprogram repair systems and has been operating since February 2017. In total, ithas studied 11 317 test failures over 1 609 open-source software projectshosted on GitHub, and has generated patches for 17 different bugs. Over months,we hit a number of hard technical challenges and had to make various design andengineering decisions. This gives us a unique experience in this area. In thispaper, we reflect upon Repairnator in order to share this knowledge with theautomatic program repair community.

How to Design a Program Repair Bot? Insights from the Repairnator Project