code: def n_exec_stmt(self, node):
          
          start = len(self.f.getvalue()) + len(self.indent)
          try:
              super(FragmentsWalker, self).n_exec_stmt(node)
          except GenericASTTraversalPruningException:
              pass
          self.set_pos_info(node, start, len(self.f.getvalue()))
          self.set_pos_info(node[-1], start, len(self.f.getvalue()))
          self.prune()
docs: exec_stmt ::= expr exprlist DUP_TOP EXEC_STMT
          exec_stmt ::= expr exprlist EXEC_STMT