kotlin.io.FileTreeWalk$FileTreeWalkIterator$BottomUpDirectoryState -> gp0:
# {"id":"sourceFile","fileName":"FileTreeWalk.kt"}
    boolean rootVisited -> b
    java.io.File[] fileList -> c
    int fileIndex -> d
    boolean failed -> e
    1:11:java.io.File step():129:129 -> a
    12:19:java.io.File step():134:134 -> a
    20:21:java.io.File step():137:137 -> a
    22:30:java.io.File step():140:140 -> a
    31:42:java.io.File step():142:142 -> a
    43:46:java.io.File step():143:143 -> a
    47:51:java.io.File step():145:145 -> a
