STEP 0:
    added file: m.kt, common.kt
STEP 1:
    modifications:
        U : test1.1.kt -> test1.kt
    added file: test1.kt
    updated exports: common.kt
STEP 2:
    modifications:
        U : test1.2.kt -> test1.kt
    modified ir: test1.kt
    updated exports: common.kt
STEP 3:
    modifications:
        U : test2.3.kt -> test2.kt
    added file: test2.kt
