Can't reference an array element.

[HughDarwen]

The following statement uses relvar reading from my electricity database:
begin;
var t array tuple same_heading_as(reading);
load t from reading order(desc Year, desc Month#);
output t(1);
end;

The output statement gives a syntax error say the operator(integer) doesn't exist, but it conforms to this BNF:

<tuple nonwith exp>
::= <tuple var ref>
| <tuple op inv>
| <array var ref> ( <subscript> )
| ( <tuple exp> )

[HughDarwen]

I've just found it's not exactly a bug, but rather a deviation from Tutorial D, and one I personally approve of!
Rel follows common practice these days in using square brackets instead of parns. t[1] worked fine.

Hugh