When practracker finds a forbidden include, it causes a Python TypeError. Example: ``` user@computer:~/tor$ make check-includes python3 ./scripts/maint/practracker/includes.py . Unusual pattern permitted.h in ./scripts/maint/practracker/testdata Forbidden include of lib/lock/compat_mutex.h at ./src/lib/evloop/eventqueue.h:8 Traceback (most recent call last): File "./scripts/maint/practracker/includes.py", line 285, in <module> main(sys.argv) File "./scripts/maint/practracker/includes.py", line 282, in main list_advisories=args.list_advisories) File "./scripts/maint/practracker/includes.py", line 240, in run_check_includes files in its enclosing directory.""".format(RULES_FNAME)) TypeError: 'Error' object is not callable make: *** [check-includes] Error 1 ``` This seems to be caused by an err() function being removed from the code sometime in the past, but the call to err() was never also removed.