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As the adoption of proof assistants increases, there is a need for efficiencyin identifying, documenting, and fixing compatibility issues that arise fromproof assistant evolution. We present the Coq Bug Minimizer, a tool forreproducing buggy behavior with minimal and standalone files, integrated withcoqbot to trigger automatically on Coq reverse CI failures. Our tool eliminatesthe overhead of having to download, set up, compile, and then explore andunderstand large developments: enabling Coq developers to easily obtain modulartest-case files for fast experimentation. In this paper, we describe insightsabout how test-case reduction is different in Coq than in traditionalcompilers. We expect that our insights will generalize to other proofassistants. We evaluate the Coq Bug Minimizer on over 150 CI failures. Our toolsucceeds in reducing failures to smaller test cases in roughly 75% of the time.The minimizer produces a fully standalone test case 89% of the time, and it ison average about one-third the size of the original test. The average reducedtest case compiles in 1.25 seconds, with 75% taking under half a second.

Automatic Test-Case Reduction in Proof Assistants: A Case Study in Coq