parameters: (self, p)
docstring: check_p21_start_token : PART21_START
docstring_summary: check_p21_start_token : PART21_START
docstring_tokens: check_p21_start_token : PART21_START
function: def p_check_start_token(self, p):
          """check_p21_start_token : PART21_START"""
          self.is_in_exchange_structure = True
          p[0] = p[1]
function_tokens: def p_check_start_token ( self , p ) : self . is_in_exchange_structure = True p [ 0 ] = p [ 1 ]