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UndefinedSemantics
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Standardised languages often have "grey areas" - features or (combinations of) conditions for which no behaviour was defined. Any implementation of the standard may react however it sees fit when it encounters such a condition, either because implementors were explicitly granted such freedom by the standardisation committee, or simply out of necessity because the committee couldn't agree on a single behaviour or just plain overlooked this condition. Examples of UndefinedSemantics include * native method calls in [Java] * #pragma defines in [C]/[C++] * many features of [HTML] Note that UndefinedSemantics means exactly that, if you add __#pragma explode__ to your [C] program, you are not allowed to be surprised that your toilet exploded.
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