diff --git a/libraries/stdlib/src/kotlin/collections/JUtil.kt b/libraries/stdlib/src/kotlin/collections/JUtil.kt
index d837b34f7b3..c27daaa8665 100644
--- a/libraries/stdlib/src/kotlin/collections/JUtil.kt
+++ b/libraries/stdlib/src/kotlin/collections/JUtil.kt
@@ -72,6 +72,7 @@ public val Collection<*>.indices: IntRange
 /**
  * Returns an [IntRange] that starts with zero and ends at the value of this number but does not include it.
  */
+deprecated("Use 0..n-1 range instead.")
 public val Int.indices: IntRange
     get() = 0..this - 1
 
diff --git a/libraries/stdlib/src/kotlin/concurrent/Locks.kt b/libraries/stdlib/src/kotlin/concurrent/Locks.kt
index df003897bec..0b09b7fd7df 100644
--- a/libraries/stdlib/src/kotlin/concurrent/Locks.kt
+++ b/libraries/stdlib/src/kotlin/concurrent/Locks.kt
@@ -58,6 +58,7 @@ public inline fun <T> ReentrantReadWriteLock.write(action: () -> T): T {
  *
  * @return the return value of the action.
  */
+deprecated("Use CountDownLatch(Int) instead and await it manually.")
 public fun <T> Int.latch(operation: CountDownLatch.() -> T): T {
     val latch = CountDownLatch(this)
     val result = latch.operation()