code: def parse_block(self, block, lineno, indent):
          
          tree = self.driver.parse_tokens(self.wrap_toks(block, lineno, indent))
          tree.future_features = frozenset()
          return tree
docs: Parses a block into a tree.
  
          This is necessary to get correct line number / offset information
          in the parser diagnostics and embedded into the parse tree.