For loop linguistic abstraction (usage)

[Filip Konvička]

>> I've also found out that the A.B:=C notation is a very common cause 
>> of runtime errors, so I prefer using the standard procedure/function 
>> call syntax to avoid this.
>
> Could you please explain.
I found myself fixing a lot of bugs like this:

local
    X=o(feature1:{NewCell 5} ...)
in
   X.feature1:=6
end

The compiler static analysis doesn't help here. You'll get a runtime error.

Cheers,
Filip