562     exit_stack = None  variable in TestBaseExitStack
567         cm_docstring = self.exit_stack.__doc__
568         obj = self.exit_stack()
572         with self.exit_stack():
589         with self.exit_stack() as stack:
607         with self.exit_stack() as stack:
611                 self.exit_stack.callback(arg=2)
633         with self.exit_stack() as stack:
659         with self.exit_stack() as stack:
671         with self.exit_stack() as stack:
682         with self.exit_stack() as stack:
695             with self.exit_stack() as stack:
700         with self.exit_stack() as stack:
764             with self.exit_stack() as stack:
803             with self.exit_stack() as stack:
826             with self.exit_stack() as stack:
835             with self.exit_stack() as stack:
862             with self.exit_stack() as stack:
889             with self.exit_stack() as stack:
907             with self.exit_stack() as stack:
914         with self.exit_stack() as stack:
921         with self.exit_stack() as stack:
929         stack = self.exit_stack()
956             with self.exit_stack() as es_ctx:
970     exit_stack = ExitStack  variable in TestExitStack