code: def p_single_statement_delays(self, p):
          'single_statement : DELAY expression SEMICOLON'
          p[0] = SingleStatement(DelayStatement(
              p[2], lineno=p.lineno(1)), lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1)f p_single_statement_delays(self, p):
          'single_statement : DELAY expression SEMICOLON'
          p[0] = SingleStatement(DelayStatement(
              p[2], lineno=p.lineno(1)), lineno=p.lineno(1))
          p.set_lineno(0, p.lineno(1))
docs: single_statement : DELAY expression SEMICOLON