-----------------------------------
At the beginning, there is no state
-----------------------------------
Flow 'resume from backend example' state: None
-------
Running
-------
executing first==1.0
-------------
After running
-------------
Flow 'resume from backend example' state: SUSPENDED
 boom==1.0: SUCCESS, result=None
 first==1.0: SUCCESS, result=ok
 second==1.0: PENDING, result=None
--------------------------
Resuming and running again
--------------------------
executing second==1.0
----------
At the end
----------
Flow 'resume from backend example' state: SUCCESS
 boom==1.0: SUCCESS, result=None
 first==1.0: SUCCESS, result=ok
 second==1.0: SUCCESS, result=ok