code: def _render(self, contexts, partials):
          
          try:
              partial = partials[self.value]
          except KeyError as e:
              return self._escape(EMPTYSTRING)
  
          partial = re_insert_indent.sub(r'\1' + ' '*self.indent, partial)
  
          return inner_render(partial, contexts, partials, self.delimiter)
docs: render partials