error loading 'ERR': Bareword "z" not allowed while "strict subs" in use at ERR line 5.
stack trace:
   L::include called at D line 1
   L::include called at C line 1
   L::include called at B line 11
   L::bar called at B line 7
   L::foo called at B line 14
   L::include called at A line 2