diff --git a/libraries/stdlib/common/src/generated/_Arrays.kt b/libraries/stdlib/common/src/generated/_Arrays.kt
index 2539d6cde98..e28f0ff2e88 100644
--- a/libraries/stdlib/common/src/generated/_Arrays.kt
+++ b/libraries/stdlib/common/src/generated/_Arrays.kt
@@ -20133,14 +20133,14 @@ public inline fun <R> CharArray.scanIndexed(initial: R, operation: (index: Int,
     return runningFoldIndexed(initial, operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 public inline fun <S, T : S> Array<out T>.scanReduce(operation: (acc: S, T) -> S): List<S> {
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
@@ -20148,7 +20148,7 @@ public inline fun ByteArray.scanReduce(operation: (acc: Byte, Byte) -> Byte): Li
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
@@ -20156,7 +20156,7 @@ public inline fun ShortArray.scanReduce(operation: (acc: Short, Short) -> Short)
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
@@ -20164,7 +20164,7 @@ public inline fun IntArray.scanReduce(operation: (acc: Int, Int) -> Int): List<I
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
@@ -20172,7 +20172,7 @@ public inline fun LongArray.scanReduce(operation: (acc: Long, Long) -> Long): Li
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
@@ -20180,7 +20180,7 @@ public inline fun FloatArray.scanReduce(operation: (acc: Float, Float) -> Float)
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
@@ -20188,7 +20188,7 @@ public inline fun DoubleArray.scanReduce(operation: (acc: Double, Double) -> Dou
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
@@ -20196,7 +20196,7 @@ public inline fun BooleanArray.scanReduce(operation: (acc: Boolean, Boolean) ->
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
@@ -20204,14 +20204,14 @@ public inline fun CharArray.scanReduce(operation: (acc: Char, Char) -> Char): Li
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 public inline fun <S, T : S> Array<out T>.scanReduceIndexed(operation: (index: Int, acc: S, T) -> S): List<S> {
     return runningReduceIndexed(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
@@ -20219,7 +20219,7 @@ public inline fun ByteArray.scanReduceIndexed(operation: (index: Int, acc: Byte,
     return runningReduceIndexed(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
@@ -20227,7 +20227,7 @@ public inline fun ShortArray.scanReduceIndexed(operation: (index: Int, acc: Shor
     return runningReduceIndexed(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
@@ -20235,7 +20235,7 @@ public inline fun IntArray.scanReduceIndexed(operation: (index: Int, acc: Int, I
     return runningReduceIndexed(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
@@ -20243,7 +20243,7 @@ public inline fun LongArray.scanReduceIndexed(operation: (index: Int, acc: Long,
     return runningReduceIndexed(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
@@ -20251,7 +20251,7 @@ public inline fun FloatArray.scanReduceIndexed(operation: (index: Int, acc: Floa
     return runningReduceIndexed(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
@@ -20259,7 +20259,7 @@ public inline fun DoubleArray.scanReduceIndexed(operation: (index: Int, acc: Dou
     return runningReduceIndexed(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
@@ -20267,7 +20267,7 @@ public inline fun BooleanArray.scanReduceIndexed(operation: (index: Int, acc: Bo
     return runningReduceIndexed(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @kotlin.internal.InlineOnly
diff --git a/libraries/stdlib/common/src/generated/_Collections.kt b/libraries/stdlib/common/src/generated/_Collections.kt
index 7ee5b90baa0..e65855cf190 100644
--- a/libraries/stdlib/common/src/generated/_Collections.kt
+++ b/libraries/stdlib/common/src/generated/_Collections.kt
@@ -2601,14 +2601,14 @@ public inline fun <T, R> Iterable<T>.scanIndexed(initial: R, operation: (index:
     return runningFoldIndexed(initial, operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 public inline fun <S, T : S> Iterable<T>.scanReduce(operation: (acc: S, T) -> S): List<S> {
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 public inline fun <S, T : S> Iterable<T>.scanReduceIndexed(operation: (index: Int, acc: S, T) -> S): List<S> {
diff --git a/libraries/stdlib/common/src/generated/_Sequences.kt b/libraries/stdlib/common/src/generated/_Sequences.kt
index 226cc14e606..215711e286e 100644
--- a/libraries/stdlib/common/src/generated/_Sequences.kt
+++ b/libraries/stdlib/common/src/generated/_Sequences.kt
@@ -2046,14 +2046,14 @@ public fun <T, R> Sequence<T>.scanIndexed(initial: R, operation: (index: Int, ac
     return runningFoldIndexed(initial, operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 public fun <S, T : S> Sequence<T>.scanReduce(operation: (acc: S, T) -> S): Sequence<S> {
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 public fun <S, T : S> Sequence<T>.scanReduceIndexed(operation: (index: Int, acc: S, T) -> S): Sequence<S> {
diff --git a/libraries/stdlib/common/src/generated/_Strings.kt b/libraries/stdlib/common/src/generated/_Strings.kt
index 799a1cf6839..f766c0ff2c4 100644
--- a/libraries/stdlib/common/src/generated/_Strings.kt
+++ b/libraries/stdlib/common/src/generated/_Strings.kt
@@ -1867,14 +1867,14 @@ public inline fun <R> CharSequence.scanIndexed(initial: R, operation: (index: In
     return runningFoldIndexed(initial, operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 public inline fun CharSequence.scanReduce(operation: (acc: Char, Char) -> Char): List<Char> {
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 public inline fun CharSequence.scanReduceIndexed(operation: (index: Int, acc: Char, Char) -> Char): List<Char> {
diff --git a/libraries/stdlib/common/src/generated/_UArrays.kt b/libraries/stdlib/common/src/generated/_UArrays.kt
index d4daf5ac8ac..bc965861343 100644
--- a/libraries/stdlib/common/src/generated/_UArrays.kt
+++ b/libraries/stdlib/common/src/generated/_UArrays.kt
@@ -9106,7 +9106,7 @@ public inline fun <R> UShortArray.scanIndexed(initial: R, operation: (index: Int
     return runningFoldIndexed(initial, operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @ExperimentalUnsignedTypes
@@ -9115,7 +9115,7 @@ public inline fun UIntArray.scanReduce(operation: (acc: UInt, UInt) -> UInt): Li
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @ExperimentalUnsignedTypes
@@ -9124,7 +9124,7 @@ public inline fun ULongArray.scanReduce(operation: (acc: ULong, ULong) -> ULong)
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @ExperimentalUnsignedTypes
@@ -9133,7 +9133,7 @@ public inline fun UByteArray.scanReduce(operation: (acc: UByte, UByte) -> UByte)
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"))
+@Deprecated("Use runningReduce instead.", ReplaceWith("runningReduce(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @ExperimentalUnsignedTypes
@@ -9142,7 +9142,7 @@ public inline fun UShortArray.scanReduce(operation: (acc: UShort, UShort) -> USh
     return runningReduce(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @ExperimentalUnsignedTypes
@@ -9151,7 +9151,7 @@ public inline fun UIntArray.scanReduceIndexed(operation: (index: Int, acc: UInt,
     return runningReduceIndexed(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @ExperimentalUnsignedTypes
@@ -9160,7 +9160,7 @@ public inline fun ULongArray.scanReduceIndexed(operation: (index: Int, acc: ULon
     return runningReduceIndexed(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @ExperimentalUnsignedTypes
@@ -9169,7 +9169,7 @@ public inline fun UByteArray.scanReduceIndexed(operation: (index: Int, acc: UByt
     return runningReduceIndexed(operation)
 }
 
-@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"))
+@Deprecated("Use runningReduceIndexed instead.", ReplaceWith("runningReduceIndexed(operation)"), level = DeprecationLevel.ERROR)
 @SinceKotlin("1.3")
 @ExperimentalStdlibApi
 @ExperimentalUnsignedTypes
diff --git a/libraries/stdlib/test/collections/IterableTests.kt b/libraries/stdlib/test/collections/IterableTests.kt
index 0e862478aa4..8dce6de37cd 100644
--- a/libraries/stdlib/test/collections/IterableTests.kt
+++ b/libraries/stdlib/test/collections/IterableTests.kt
@@ -468,18 +468,16 @@ abstract class IterableTests<T : Iterable<String>>(val createFrom: (Array<out St
     }
 
     @Test
-    @Suppress("DEPRECATION")
-    fun scanReduce() {
-        val accumulators = data.scanReduce { acc, e -> acc + e }
+    fun runningReduce() {
+        val accumulators = data.runningReduce { acc, e -> acc + e }
         assertEquals(2, accumulators.size)
         assertTrue(accumulators.first() in listOf("foo", "bar"))
         assertTrue(accumulators.last() in listOf("foobar", "barfoo"))
     }
 
     @Test
-    @Suppress("DEPRECATION")
-    fun scanReduceIndexed() {
-        val accumulators = data.scanReduceIndexed { i, acc, e -> acc + i + e }
+    fun runningReduceIndexed() {
+        val accumulators = data.runningReduceIndexed { i, acc, e -> acc + i + e }
         assertEquals(2, accumulators.size)
         assertTrue(accumulators.first() in listOf("foo", "bar"))
         assertTrue(accumulators.last() in listOf("foo1bar", "bar1foo"))
diff --git a/libraries/tools/kotlin-stdlib-gen/src/templates/Aggregates.kt b/libraries/tools/kotlin-stdlib-gen/src/templates/Aggregates.kt
index 1111869274e..b3f7657311f 100644
--- a/libraries/tools/kotlin-stdlib-gen/src/templates/Aggregates.kt
+++ b/libraries/tools/kotlin-stdlib-gen/src/templates/Aggregates.kt
@@ -1797,7 +1797,7 @@ object Aggregates : TemplateGroupBase() {
     } builder {
         since("1.3")
         annotation("@ExperimentalStdlibApi")
-        deprecate(Deprecation("Use runningReduce instead.", "runningReduce(operation)", DeprecationLevel.WARNING))
+        deprecate(Deprecation("Use runningReduce instead.", "runningReduce(operation)", DeprecationLevel.ERROR))
 
         specialFor(CharSequences) { inline() }
         specialFor(ArraysOfPrimitives, ArraysOfUnsigned) { inlineOnly() }
@@ -1812,7 +1812,7 @@ object Aggregates : TemplateGroupBase() {
     } builder {
         since("1.3")
         annotation("@ExperimentalStdlibApi")
-        deprecate(Deprecation("Use runningReduceIndexed instead.", "runningReduceIndexed(operation)", DeprecationLevel.WARNING))
+        deprecate(Deprecation("Use runningReduceIndexed instead.", "runningReduceIndexed(operation)", DeprecationLevel.ERROR))
 
         specialFor(CharSequences) { inline() }
         specialFor(ArraysOfPrimitives, ArraysOfUnsigned) { inlineOnly() }
@@ -1827,7 +1827,7 @@ object Aggregates : TemplateGroupBase() {
     } builder {
         since("1.3")
         annotation("@ExperimentalStdlibApi")
-        deprecate(Deprecation("Use runningReduce instead.", "runningReduce(operation)", DeprecationLevel.WARNING))
+        deprecate(Deprecation("Use runningReduce instead.", "runningReduce(operation)", DeprecationLevel.ERROR))
 
         specialFor(ArraysOfObjects, Iterables) { inline() }
 
@@ -1844,7 +1844,7 @@ object Aggregates : TemplateGroupBase() {
     } builder {
         since("1.3")
         annotation("@ExperimentalStdlibApi")
-        deprecate(Deprecation("Use runningReduceIndexed instead.", "runningReduceIndexed(operation)", DeprecationLevel.WARNING))
+        deprecate(Deprecation("Use runningReduceIndexed instead.", "runningReduceIndexed(operation)", DeprecationLevel.ERROR))
 
         specialFor(ArraysOfObjects, Iterables) { inline() }