STEP 0:
    modifications:
        U : A.0.kt -> A.kt
        U : B.0.kt -> B.kt
        U : C.0.kt -> C.kt
    added file: A.kt, B.kt, C.kt
STEP 1:
    updated exports: A.kt, B.kt
STEP 2:
    updated exports: A.kt
STEP 3:
    updated exports: C.kt
