1290     char_u	*op,  in set_var_lval()  argument
1307 	    if (op != NULL && *op != '=')  in set_var_lval()
1309 		semsg(_(e_letwrong), op);  in set_var_lval()
1331 	else if (op != NULL && *op != '=')  in set_var_lval()
1351 			&& tv_op(&tv, rettv, op) == OK)  in set_var_lval()
1381 			 lp->ll_n1, lp->ll_n2, lp->ll_empty2, op, lp->ll_name);  in set_var_lval()
1402 	    if (op != NULL && *op != '=')  in set_var_lval()
1422 	else if (op != NULL && *op != '=')  in set_var_lval()
1424 	    tv_op(lp->ll_tv, rettv, op);  in set_var_lval()
1450 tv_op(typval_T *tv1, typval_T *tv2, char_u *op)  in tv_op()  argument
1461 								|| *op == '.'))  in tv_op()
1479 		if (*op != '+' || tv2->v_type != VAR_BLOB)  in tv_op()
1493 		if (*op != '+' || tv2->v_type != VAR_LIST)  in tv_op()
1512 		if (vim_strchr((char_u *)"+-*/%", *op) != NULL)  in tv_op()
1521 			if (*op == '%')  in tv_op()
1523 			switch (*op)  in tv_op()
1537 			switch (*op)  in tv_op()
1571 		    if (*op == '%' || *op == '.'  in tv_op()
1580 		    switch (*op)  in tv_op()
1593     semsg(_(e_letwrong), op);  in tv_op()
2870 	int	    op;  in eval5()  local
2880 	op = *p;  in eval5()
2881 	concat = op == '.' && (*(p + 1) == '.' || in_old_script(2));  in eval5()
2882 	if ((op != '+' && op != '-' && !concat) || p[1] == '='  in eval5()
2885 	if (getnext && (op == '+' || op == '-') && p[0] == p[1])  in eval5()
2902 	if ((op != '+' || (rettv->v_type != VAR_LIST  in eval5()
2905 		&& (op == '.' || rettv->v_type != VAR_FLOAT)  in eval5()
2918 	    if (op != '.')  in eval5()
2920 	    if ((op == '.' && tv_get_string_chk(rettv) == NULL) || error)  in eval5()
2937 	if (eval6(arg, &var2, evalarg, !vim9script && op == '.') == FAIL)  in eval5()
2948 	    if (op == '.')  in eval5()
2980 	    else if (op == '+' && rettv->v_type == VAR_BLOB  in eval5()
2983 	    else if (op == '+' && rettv->v_type == VAR_LIST  in eval5()
3047 		    if (op == '+')  in eval5()
3057 		    if (op == '+')  in eval5()
3108 	int	    op;  in eval6()  local
3117 	op = *p;  in eval6()
3118 	if ((op != '*' && op != '/' && op != '%') || p[1] == '=')  in eval6()
3205 		if (op == '*')  in eval6()
3207 		else if (op == '/')  in eval6()
3241 		if (op == '*')  in eval6()
3243 		else if (op == '/')  in eval6()