STEP 0:
    modifications:
        U : l1a.0.kt -> l1a.kt
        U : l1b.0.kt -> l1b.kt
    added file: l1a.kt, l1b.kt, l1c.kt
STEP 1:
    modifications:
        U : l1a.1.kt -> l1a.kt
    modified ir: l1a.kt
    updated exports: l1a.kt, l1c.kt
STEP 2:
    modifications:
        U : l1a.2.kt -> l1a.kt
    modified ir: l1a.kt
    updated exports: l1a.kt, l1c.kt
STEP 3:
    modifications:
        U : l1b.3.kt -> l1b.kt
    modified ir: l1b.kt
