Implement get_refs function for DrtLambdaExpression #2847
Merged
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This update implemets get_refs function for a DrtLambdaExpression. This function is called when a simplify() on DrtLambdaExpression is called. It returns a list of bound variables within the object of type DrtLambdaExpression. The issue caused without this function was reported in #2844 .
Should fix #2844