STEP 0:
    dependencies: lib1
    added file: l21.kt
STEP 1:
    dependencies: lib1
    modifications:
        U : l22.1.kt -> l22.kt
    added file: l22.kt
    removed direct depends: l21.kt
STEP 2:
    dependencies: lib1
    modifications:
        D : l22.kt
    removed direct depends: l21.kt
    removed file: l22.kt
