code: def _module_callers(parser, modname, result):
      
      if modname in result:
          #We have already processed this module.
          return
      
      module = parser.get(modname)
      mresult = {}
      if module is not None:
          for xname, xinst in module.executables():
              _exec_callers(xinst, mresult)
          result[modname] = mresult
          
          for depkey in module.dependencies:
              depmod = depkey.split('.')[0].lower()
              _module_callers(parser, depmod, result)
docs: Adds any calls to executables contained in the specified module.