Some -> USimpleNameReferenceExpression (identifier = Some) from KtNameReferenceExpression
T -> USimpleNameReferenceExpression (identifier = T) from KtNameReferenceExpression
List -> USimpleNameReferenceExpression (identifier = List) from KtNameReferenceExpression
Any -> USimpleNameReferenceExpression (identifier = Any) from KtNameReferenceExpression
mapTo(mutableSetOf()) {

    } -> UQualifiedReferenceExpression from KtDotQualifiedExpression
filterIsInstance<Some>() -> UQualifiedReferenceExpression from KtDotQualifiedExpression
list -> USimpleNameReferenceExpression (identifier = list) from KtNameReferenceExpression
filterIsInstance -> [!] UnknownKotlinExpression (CALL_EXPRESSION) from KtNameReferenceExpression
Some -> USimpleNameReferenceExpression (identifier = Some) from KtNameReferenceExpression
mapTo -> [!] UnknownKotlinExpression (CALL_EXPRESSION) from KtNameReferenceExpression
mutableSetOf -> [!] UnknownKotlinExpression (CALL_EXPRESSION) from KtNameReferenceExpression
