STEP 0:
    added file: f1.kt
STEP 1:
    modifications:
        U : f1.1.kt -> f1.kt
        U : f2.1.kt -> f2.kt
    modified ir: f1.kt
    added file: f2.kt
STEP 2:
    modifications:
        U : f2.2.kt -> f2.kt
    modified ir: f2.kt
    updated imports: f1.kt
STEP 3:
    modifications:
        U : f1.3.kt -> f1.kt
    modified ir: f1.kt
STEP 4:
    modifications:
        U : f2.4.kt -> f2.kt
    modified ir: f2.kt
    updated imports: f1.kt
