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Beaujolais effect
Beaujolais effect is the name given to a class of potential semantic errors in Jean Ichbiah's draft specifications for the programming language Ada. The name arose from Ichbiah's promise to give a bottle of Beaujolais nouveau red wine to anyone who could find such a situation in the draft language standard. At least one bottle was actually awarded for such a discovery.〔(What is the "Beaujolais Effect"? )〕
== 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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