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From: Alfred Hilscher <Alfred.Hilscher@t-online.de>
Newsgroups: comp.lang.ada
Subject: Re: Why is Ada NOT a good choice for a beginner to programming?
Date: Mon, 23 Dec 2002 12:11:06 +0100
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Date: 2002-12-23T12:11:06+01:00
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"James S. Rogers" schrieb:
> 
> 
> Constraint_Error is a run time exception. The compiler cannot detect all
> possible errors. Some are detectable only at run time. 

Sure, but there are some sort of statements where the compiler KNOWS
that there an exception will be raised. So - why not give a warning at
compile time? The Aonix compiler do so!!!

> The GNAT
> compiler identifies the location in the code where a Constraint_Error
> was raised. It is up to the programmer to the trace through the code
> to determine the initial cause of the error. Often the initial cause is
> improper logic some distance from the location where the exception
> is raised. In the case of the thread mentioned above, the error was
> caused primarily by unfounded assumptions made by the OP.

Nevertheeless the compiler could give a hint during compilation,
couldn`t it?

> According to the RM the compiler and run time system behaved
> properly.

Yes, yes. The behaviour is correct, but it could be more supportive.
Don`t you think it's good to be informed early? Ok, then lets switch
back to C (_all_ errors will be detected during runtime).