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8.3.9 VarIsNullReference

VarIsNullReferenceは、Subjectバリアントにコンポーネント参照が入っていて、その参照が*NULLコンポーネント参照である場合にブール値のTrueを返し、そうでない場合にブール値のFalseを返します。
VarIsNullReference( Subject )  
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