code: def resolve(self, context, provider):
          
          try:
              self._value.resolve(context, provider)
          except FailedLookup as e:
              raise FailedVariableLookup(self.name, e.lookup, e.error)
docs: Recursively resolve any lookups with the Variable.
  
          Args:
              context (:class:`stacker.context.Context`): Current context for
                  building the stack
              provider (:class:`stacker.provider.base.BaseProvider`): subclass of
                  the base provider