KT element: KtForExpression
FIR element: FirWhileLoopImpl
FIR source kind: KtRealSourceElementKind

FIR element rendered:
while(R|<local>/<iterator>|.R|SubstitutionOverride<kotlin/collections/IntIterator.hasNext: R|kotlin/Boolean|>|()) {
    lval x: R|kotlin/Int| = R|<local>/<iterator>|.R|kotlin/collections/IntIterator.next|()
}