root:
             product   file:plan.py
             product   step:./plan.py

file:plan.py
               state = CONFIRMED
             creator   root:
                sink   step:./plan.py

step:./plan.py
               state = SUCCEEDED
                need = PLAN
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   root:
              source   file:plan.py
             product   file:big.py
             product   file:fail.py
             product   step:./big.py
             product   step:./fail.py

file:big.py
               state = CONFIRMED
             creator   step:./plan.py
                sink   step:./big.py

file:fail.py
               state = CONFIRMED
             creator   step:./plan.py
                sink   step:./fail.py

step:./big.py
               state = SUCCEEDED
                need = DEFAULT
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   step:./plan.py
              source   file:big.py

step:./fail.py
               state = FAILED
                need = DEFAULT
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   step:./plan.py
              source   file:fail.py
