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From: tgingold@pc204.ipricot.fr
Newsgroups: comp.lang.ada
Subject: Re: Relational Operators
Date: 29 Oct 2001 08:44:31 GMT
Organization: DotCom Network
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References: <3BD959E1.6C0AD647@hotmail.com>
 <69eC7.1430$xS6.1903@www.newsranger.com>
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Date: 2001-10-29T08:44:31+00:00
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In article <69eC7.1430$xS6.1903@www.newsranger.com>, Ted Dennison wrote:
> In article <3BD959E1.6C0AD647@hotmail.com>, Gordon Cooke says...
>>
>>Is this code legal?
>>
>>procedure Test is
>>   B : Boolean;
>>begin
>>   B := True = True = True;
>>end Test;
> 
> Yes. It looks like you found a compiler bug in Gnat. Good job. :-)
No, this code is not legal:
according to LRM 4.4:
relation ::= 
     simple_expression [relational_operator simple_expression]
   | simple_expression [not] in range
   | simple_expression [not] in subtype_mark

And LRM 4.5 says:
relational_operator ::=   =   | /=  | <   | <= | > | >=

Therefore, A = B = C is not legal.

Tristan.