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From: dewar@gnat.com
Subject: Re: Positional Aggregates
Date: 1998/11/12
Message-ID: <72dk3n$tda$1@nnrp1.dejanews.com>#1/1
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In article <72cq2h$7bd$1@nnrp1.dejanews.com>,
  dennison@telepath.com wrote:
> >    error: positional aggregate cannot have
> >                                          one component
> >
> > Is this valid for an array with only one element?
>
> It never worked for me before. Try
>
>     Files_Index : array (1..Files_Used) of Integer :=
>                                          (others => 17);
>
> BTW: That's the best error message for that error I've
> ever seen.

Thankyou for that nice note! The GNAT circuit for producing
this error message is indeed a little tricky, but we found
it was a common error and thus worth the effort to special
case the error message :-)

Strictly of course (17) simply is not an aggregate at all
but just a parenthesized expression. What GNAT does here is
to specially check for a parenthesized expression of type
foo in a context expecting array-of-foo.


Robert Dewar
Ada Core Technologies



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