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Date: Fri, 11 Jan 2013 09:10:26 -0800 (PST)
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Subject: Re: Press Release - Ada 2012 Language Standard Approved by ISO
From: Marius Amado-Alves <amado.alves@gmail.com>
Cc: mailbox@dmitry-kazakov.de
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Date: 2013-01-11T09:10:26-08:00
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>    subtype More_Fun_Number is Integer with
> 
>       Dynamic_Predicate => Random = More_Fun_Number;

:-)

Prolog has a "maybe" that succeeds a certain percentage of calls. This could be used to implement it.

   declare
      X : More_Fun_Number;
   begin
      return Success;
   end;
exception
   when other => return Failure;

Maybe Ada will grow non-determinism.