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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Case sensitivity (was Re: no title)
Date: 06 Jun 2003 10:01:56 +0100
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Date: 2003-06-06T10:01:56+01:00
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James Rogers <jimmaureenrogers@att.net> writes:

> When I place this snippet into a real program I do get a clean
> compile. The program does generate an exception at run time on
> the first loop iteration.
> 
> with Ada.Text_Io;
> use Ada.Text_Io;
> procedure Badloop is 
>    type Foo_Array is array (1 .. 10) of Integer; 
>    My_Array        : Foo_Array := (10, 9, 8, 7, 6, 5, 4, 3, 2, 1);  
>    Current_Maximum : Integer   := 1;  
> begin
>    for Index in My_Array'range loop
>       declare
>          Index : Integer := 27;  
>       begin
>          if My_Array ( Index ) > Current_Maximum
>                then
>             Current_Maximum := My_Array ( Index );
>             Index := Index;
>          end if;
>       end;
>    end loop;
>    Put_Line("Current_Maximum:" & Integer'Image(Current_Maximum));
> end Badloop;

GNAT 3.16a says (-gnatwaL => all warnings except elaboration order):

   smaug[60]$ gnatmake -g -O2 -gnatwaL badloop
   gcc -c -g -O2 -gnatwaL badloop.adb
   badloop.adb:5:04: warning: "My_Array" is not modified, could be declared constant
   badloop.adb:12:24: warning: value not in range of subtype of "Standard.Integer" defined at line 4
   badloop.adb:12:24: warning: "Constraint_Error" will be raised at run time
   badloop.adb:14:43: warning: value not in range of subtype of "Standard.Integer" defined at line 4
   badloop.adb:14:43: warning: "Constraint_Error" will be raised at run time
   badloop.adb:15:19: warning: useless assignment of "Index" to itself
   gnatbind -x badloop.ali
   gnatlink badloop.ali -g
   smaug[61]$ ./badloop

   raised CONSTRAINT_ERROR : badloop.adb:12 range check failed

without -gnatwaL, the first and last warnings are omitted.