Definition
The Beaujolais effect is a situation where adding or removing a single use clause in an Ada program changes the behavior of the compiled program, a very undesirable effect in a language designed for semantic precision. Ichbiah took steps to prevent the effect when he updated his draft standard to produce the final Ada 83 language standard. The remaining possible situations for producing the effect were later identified by mathematical analysis and addressed by the Ada 95 language standard, making any situation that still resulted in a Beaujolais effect in Ada 83 an illegal construct in the more recent Ada 95 language standard.
In principle, the Beaujolais Effect can occur in other languages that use namespaces or packages, if the language specification does not ensure to make it illegal.
Read more about this topic: Beaujolais Effect
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