kotlinx.coroutines.sync.Mutex -> sf4:
# {"id":"sourceFile","fileName":"Mutex.kt"}
    java.lang.Object lock(java.lang.Object,kotlin.coroutines.Continuation) -> e
      # {"id":"com.android.tools.r8.residualsignature","signature":"(Ljb1;)Ljava/lang/Object;"}
    void unlock(java.lang.Object) -> k
