STEP 0:
    modifications:
        U : m.0.kt -> m.kt
    added file: m.kt, A.kt, B.kt, crossUsage2.kt, usage.kt, usage2.kt
STEP 1:
    modifications:
        U : m.1.kt -> m.kt
    updated exports: usage.kt
    modified ir: m.kt
STEP 2:
    modifications:
        U : A.kt -> C.kt