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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: lexical ambiguity
Date: 07 Jun 2006 10:49:31 -0400
Organization: The World Public Access UNIX, Brookline, MA
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Date: 2006-06-07T10:49:31-04:00
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M E Leypold <development-2006-8ecbb5cc8a-REMOVETHIS@m-e-leypold.de> writes:

> So now (question to all): Is the following rule enough?
> 
>    - "'" is the beginning of a character literal if the token before
>      "'" has not been an identifier (reserved words not counted as
>      identifier in this case).

Not quite:

    function F(X: Integer) return String;

    Length: constant Natural := F(123)'Length;

    Y: access T'Class := ...;
    Z: access T2'Class := Y.all'Access;

For reserved words, I think you have to study the grammar, and determine
which ones can precede a tick mark.

- Bob