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Reply-To: "Frank J. Lhota" <NOSPAM.FrankLho@rcn.com>
From: "Frank J. Lhota" <NOSPAM.FrankLho@rcn.com>
Newsgroups: comp.lang.ada
References: <1nozvv83n7lhc.1b3qf0olmyllp$.dlg@40tude.net>
 <n-6dnQKIUdPzIB3Z4p2dnA@rcn.net> <w_8gg.760526$084.110855@attbi_s22>
Subject: Re: lexical ambiguity
Date: Sun, 4 Jun 2006 13:33:41 -0400
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Date: 2006-06-04T13:33:41-04:00
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"Jeffrey R. Carter" <spam.not.jrcarter@acm.not.spam.org> wrote in message 
news:w_8gg.760526$084.110855@attbi_s22...
> Frank J. Lhota wrote:
>>
>> - are used in aggregates, such as Rational'(Num =>1, Demom => 2).
>
> This is a qualified expression, as is Integer'(I). It just happens that 
> the expression is an aggregate. Aggregates themselves don't use the 
> apostrophe:
>
> R : Rational := (Num => 1, Denom => 2);

Yes, of course you're right. The main point is that the multiple uses of 
single quote is the one thing that the Ada lexer needs to be especially 
careful about. Make sure that your lexer can handle the following exression 
properly:

    Foo'(',',',',',' ... )