When CHASE_MKDIR_0755 is specified without CHASE_NONEXISTENT and CHASE_PARENT, then chase() succeeds only when the file specified by the path already exists, and in that case, chase() does not create any parent directories, and CHASE_MKDIR_0755 is meaningless. Let's mention that CHASE_MKDIR_0755 needs to be specified with CHASE_NONEXISTENT or CHASE_PARENT, and adds a assertion about that.
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