Our scandir() function crashes if the directory to scan does not exist, which can happen if e.g. a tempory directory is deleted during collection (as in HypothesisWorks/hypothesis#4200). I therefore propose catching the directory-not-found error and returning [] in this case:

try: with os.scandir(path) as s: scanned = list(s) except FileNotFoundError: return [] # Skip entries with symlink loops and other brokenness, so the caller # doesn't have to deal with it. for entry in scanned: ...