Cleanup warnings in stdlib and generated code

js/js.libraries/src/core/generated/_ArraysJs.kt

@@ -2158,6 +2158,7 @@ public inline fun <T> Array<out T>.single(predicate: (T) -> Boolean): T {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as T
 }
 
@@ -2175,6 +2176,7 @@ public inline fun ByteArray.single(predicate: (Byte) -> Boolean): Byte {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Byte
 }
 
@@ -2192,6 +2194,7 @@ public inline fun ShortArray.single(predicate: (Short) -> Boolean): Short {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Short
 }
 
@@ -2209,6 +2212,7 @@ public inline fun IntArray.single(predicate: (Int) -> Boolean): Int {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Int
 }
 
@@ -2226,6 +2230,7 @@ public inline fun LongArray.single(predicate: (Long) -> Boolean): Long {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Long
 }
 
@@ -2243,6 +2248,7 @@ public inline fun FloatArray.single(predicate: (Float) -> Boolean): Float {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Float
 }
 
@@ -2260,6 +2266,7 @@ public inline fun DoubleArray.single(predicate: (Double) -> Boolean): Double {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Double
 }
 
@@ -2277,6 +2284,7 @@ public inline fun BooleanArray.single(predicate: (Boolean) -> Boolean): Boolean
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Boolean
 }
 
@@ -2294,6 +2302,7 @@ public inline fun CharArray.single(predicate: (Char) -> Boolean): Char {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Char
 }
 

js/js.libraries/src/core/generated/_CollectionsJs.kt

@@ -255,6 +255,7 @@ public fun <@kotlin.internal.OnlyInputTypes T> Iterable<T>.indexOf(element: T):
 /**
  * Returns first index of [element], or -1 if the list does not contain element.
  */
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER") // false warning, extension takes precedence in some cases
 public fun <@kotlin.internal.OnlyInputTypes T> List<T>.indexOf(element: T): Int {
     return indexOf(element)
 }
@@ -355,6 +356,7 @@ public inline fun <T> Iterable<T>.last(predicate: (T) -> Boolean): T {
         }
     }
     if (!found) throw NoSuchElementException("Collection contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return last as T
 }
 
@@ -389,6 +391,7 @@ public fun <@kotlin.internal.OnlyInputTypes T> Iterable<T>.lastIndexOf(element:
 /**
  * Returns last index of [element], or -1 if the list does not contain element.
  */
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER") // false warning, extension takes precedence in some cases
 public fun <@kotlin.internal.OnlyInputTypes T> List<T>.lastIndexOf(element: T): Int {
     return lastIndexOf(element)
 }
@@ -486,6 +489,7 @@ public inline fun <T> Iterable<T>.single(predicate: (T) -> Boolean): T {
         }
     }
     if (!found) throw NoSuchElementException("Collection contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as T
 }
 

js/js.libraries/src/core/generated/_SequencesJs.kt

@@ -209,6 +209,7 @@ public inline fun <T> Sequence<T>.last(predicate: (T) -> Boolean): T {
         }
     }
     if (!found) throw NoSuchElementException("Sequence contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return last as T
 }
 
@@ -289,6 +290,7 @@ public inline fun <T> Sequence<T>.single(predicate: (T) -> Boolean): T {
         }
     }
     if (!found) throw NoSuchElementException("Sequence contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as T
 }
 

js/js.libraries/src/core/generated/_StringsJs.kt

@@ -189,6 +189,7 @@ public inline fun CharSequence.single(predicate: (Char) -> Boolean): Char {
         }
     }
     if (!found) throw NoSuchElementException("Char sequence contains no character matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Char
 }
 

libraries/stdlib/common/src/generated/_Collections.kt

@@ -148,6 +148,7 @@ public header fun <@kotlin.internal.OnlyInputTypes T> Iterable<T>.indexOf(elemen
 /**
  * Returns first index of [element], or -1 if the list does not contain element.
  */
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER") // false warning, extension takes precedence in some cases
 public header fun <@kotlin.internal.OnlyInputTypes T> List<T>.indexOf(element: T): Int
 
 /**
@@ -202,6 +203,7 @@ public header fun <@kotlin.internal.OnlyInputTypes T> Iterable<T>.lastIndexOf(el
 /**
  * Returns last index of [element], or -1 if the list does not contain element.
  */
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER") // false warning, extension takes precedence in some cases
 public header fun <@kotlin.internal.OnlyInputTypes T> List<T>.lastIndexOf(element: T): Int
 
 /**

libraries/stdlib/src/generated/_Arrays.kt

@@ -2156,6 +2156,7 @@ public inline fun <T> Array<out T>.single(predicate: (T) -> Boolean): T {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as T
 }
 
@@ -2173,6 +2174,7 @@ public inline fun ByteArray.single(predicate: (Byte) -> Boolean): Byte {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Byte
 }
 
@@ -2190,6 +2192,7 @@ public inline fun ShortArray.single(predicate: (Short) -> Boolean): Short {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Short
 }
 
@@ -2207,6 +2210,7 @@ public inline fun IntArray.single(predicate: (Int) -> Boolean): Int {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Int
 }
 
@@ -2224,6 +2228,7 @@ public inline fun LongArray.single(predicate: (Long) -> Boolean): Long {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Long
 }
 
@@ -2241,6 +2246,7 @@ public inline fun FloatArray.single(predicate: (Float) -> Boolean): Float {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Float
 }
 
@@ -2258,6 +2264,7 @@ public inline fun DoubleArray.single(predicate: (Double) -> Boolean): Double {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Double
 }
 
@@ -2275,6 +2282,7 @@ public inline fun BooleanArray.single(predicate: (Boolean) -> Boolean): Boolean
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Boolean
 }
 
@@ -2292,6 +2300,7 @@ public inline fun CharArray.single(predicate: (Char) -> Boolean): Char {
         }
     }
     if (!found) throw NoSuchElementException("Array contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Char
 }
 
@@ -13663,6 +13672,7 @@ public fun CharArray.sort(): Unit {
  */
 @kotlin.internal.InlineOnly
 public inline fun <T: Comparable<T>> Array<out T>.sort(): Unit {
+    @Suppress("UNCHECKED_CAST")
     (this as Array<Any?>).sort()
 }
 

libraries/stdlib/src/generated/_Collections.kt

@@ -255,6 +255,7 @@ public fun <@kotlin.internal.OnlyInputTypes T> Iterable<T>.indexOf(element: T):
 /**
  * Returns first index of [element], or -1 if the list does not contain element.
  */
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER") // false warning, extension takes precedence in some cases
 public fun <@kotlin.internal.OnlyInputTypes T> List<T>.indexOf(element: T): Int {
     return indexOf(element)
 }
@@ -355,6 +356,7 @@ public inline fun <T> Iterable<T>.last(predicate: (T) -> Boolean): T {
         }
     }
     if (!found) throw NoSuchElementException("Collection contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return last as T
 }
 
@@ -389,6 +391,7 @@ public fun <@kotlin.internal.OnlyInputTypes T> Iterable<T>.lastIndexOf(element:
 /**
  * Returns last index of [element], or -1 if the list does not contain element.
  */
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER") // false warning, extension takes precedence in some cases
 public fun <@kotlin.internal.OnlyInputTypes T> List<T>.lastIndexOf(element: T): Int {
     return lastIndexOf(element)
 }
@@ -486,6 +489,7 @@ public inline fun <T> Iterable<T>.single(predicate: (T) -> Boolean): T {
         }
     }
     if (!found) throw NoSuchElementException("Collection contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as T
 }
 

libraries/stdlib/src/generated/_Sequences.kt

@@ -209,6 +209,7 @@ public inline fun <T> Sequence<T>.last(predicate: (T) -> Boolean): T {
         }
     }
     if (!found) throw NoSuchElementException("Sequence contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return last as T
 }
 
@@ -289,6 +290,7 @@ public inline fun <T> Sequence<T>.single(predicate: (T) -> Boolean): T {
         }
     }
     if (!found) throw NoSuchElementException("Sequence contains no element matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as T
 }
 

libraries/stdlib/src/generated/_Strings.kt

@@ -189,6 +189,7 @@ public inline fun CharSequence.single(predicate: (Char) -> Boolean): Char {
         }
     }
     if (!found) throw NoSuchElementException("Char sequence contains no character matching the predicate.")
+    @Suppress("UNCHECKED_CAST")
     return single as Char
 }
 

libraries/stdlib/src/kotlin/collections/AbstractIterator.kt

@@ -28,6 +28,7 @@ public abstract class AbstractIterator<T>: Iterator<T> {
     override fun next(): T {
         if (!hasNext()) throw NoSuchElementException()
         state = State.NotReady
+        @Suppress("UNCHECKED_CAST")
         return nextValue as T
     }
 

libraries/stdlib/src/kotlin/collections/Collections.kt

@@ -173,6 +173,7 @@ public inline fun <T> java.util.Enumeration<T>.toList(): List<T> = java.util.Col
  *
  * Allows to overcome type-safety restriction of `containsAll` that requires to pass a collection of type `Collection<E>`.
  */
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER") // false warning, extension takes precedence in some cases
 @kotlin.internal.InlineOnly
 public inline fun <@kotlin.internal.OnlyInputTypes T> Collection<T>.containsAll(elements: Collection<T>): Boolean = this.containsAll(elements)
 

libraries/stdlib/src/kotlin/collections/Grouping.kt

@@ -97,6 +97,7 @@ public inline fun <T, K, R> Grouping<T, K>.fold(
         initialValueSelector: (key: K, element: T) -> R,
         operation: (key: K, accumulator: R, element: T) -> R
 ): Map<K, R> =
+        @Suppress("UNCHECKED_CAST")
         aggregate { key, acc, e, first -> operation(key, if (first) initialValueSelector(key, e) else acc as R, e) }
 
 /**
@@ -126,6 +127,7 @@ public inline fun <T, K, R, M : MutableMap<in K, R>> Grouping<T, K>.foldTo(
         initialValueSelector: (key: K, element: T) -> R,
         operation: (key: K, accumulator: R, element: T) -> R
 ): M =
+        @Suppress("UNCHECKED_CAST")
         aggregateTo(destination) { key, acc, e, first -> operation(key, if (first) initialValueSelector(key, e) else acc as R, e) }
 
 
@@ -145,6 +147,7 @@ public inline fun <T, K, R> Grouping<T, K>.fold(
         initialValue: R,
         operation: (accumulator: R, element: T) -> R
 ): Map<K, R> =
+        @Suppress("UNCHECKED_CAST")
         aggregate { _, acc, e, first -> operation(if (first) initialValue else acc as R, e) }
 
 /**
@@ -168,6 +171,7 @@ public inline fun <T, K, R, M : MutableMap<in K, R>> Grouping<T, K>.foldTo(
         initialValue: R,
         operation: (accumulator: R, element: T) -> R
 ): M =
+        @Suppress("UNCHECKED_CAST")
         aggregateTo(destination) { _, acc, e, first -> operation(if (first) initialValue else acc as R, e) }
 
 
@@ -190,6 +194,7 @@ public inline fun <S, T : S, K> Grouping<T, K>.reduce(
         operation: (key: K, accumulator: S, element: T) -> S
 ): Map<K, S> =
         aggregate { key, acc, e, first ->
+            @Suppress("UNCHECKED_CAST")
             if (first) e else operation(key, acc as S, e)
         }
 
@@ -216,6 +221,7 @@ public inline fun <S, T : S, K, M : MutableMap<in K, S>> Grouping<T, K>.reduceTo
         operation: (key: K, accumulator: S, element: T) -> S
 ): M =
         aggregateTo(destination) { key, acc, e, first ->
+            @Suppress("UNCHECKED_CAST")
             if (first) e else operation(key, acc as S, e)
         }
 
@@ -283,6 +289,7 @@ public inline fun <T, K, M : MutableMap<in K, Int>> Grouping<T, K>.eachSumOfTo(d
 @JvmVersion
 @PublishedApi
 @kotlin.internal.InlineOnly
+@Suppress("UNCHECKED_CAST") // tricks with erased generics go here, do not repeat at reified platforms
 internal inline fun <K, V, R> MutableMap<K, V>.mapValuesInPlace(f: (Map.Entry<K, V>) -> R): MutableMap<K, R> {
     entries.forEach {
         (it as MutableMap.MutableEntry<K, R>).setValue(f(it))

libraries/stdlib/src/kotlin/collections/Maps.kt

@@ -175,6 +175,7 @@ public inline fun <@kotlin.internal.OnlyInputTypes K> Map<out K, *>.containsKey(
  *
  * Allows to overcome type-safety restriction of `containsValue` that requires to pass a value of type `V`.
  */
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER") // false warning, extension takes precedence in some cases
 @kotlin.internal.InlineOnly
 public inline fun <K, @kotlin.internal.OnlyInputTypes V> Map<K, V>.containsValue(value: V): Boolean = this.containsValue(value)
 
@@ -235,6 +236,7 @@ internal inline fun <K, V> Map<K, V>.getOrElseNullable(key: K, defaultValue: ()
     if (value == null && !containsKey(key)) {
         return defaultValue()
     } else {
+        @Suppress("UNCHECKED_CAST")
         return value as V
     }
 }

libraries/stdlib/src/kotlin/collections/MutableCollections.kt

@@ -48,11 +48,13 @@ public inline fun <T> MutableList<T>.remove(index: Int): T = removeAt(index)
 @Deprecated("Use sortWith(comparator) instead.", ReplaceWith("this.sortWith(comparator)"), level = DeprecationLevel.ERROR)
 @JvmVersion
 @kotlin.internal.InlineOnly
+@Suppress("UNUSED_PARAMETER")
 public inline fun <T> MutableList<T>.sort(comparator: Comparator<in T>): Unit = throw NotImplementedError()
 
 @Deprecated("Use sortWith(Comparator(comparison)) instead.", ReplaceWith("this.sortWith(Comparator(comparison))"), level = DeprecationLevel.ERROR)
 @JvmVersion
 @kotlin.internal.InlineOnly
+@Suppress("UNUSED_PARAMETER")
 public inline fun <T> MutableList<T>.sort(comparison: (T, T) -> Int): Unit = throw NotImplementedError()
 
 /**

libraries/stdlib/src/kotlin/collections/Sequences.kt

@@ -123,6 +123,7 @@ internal class FilteringSequence<T>(private val sequence: Sequence<T>,
             val result = nextItem
             nextItem = null
             nextState = -1
+            @Suppress("UNCHECKED_CAST")
             return result as T
         }
 
@@ -380,6 +381,7 @@ internal class TakeWhileSequence<T>
                 calcNext() // will change nextState
             if (nextState == 0)
                 throw NoSuchElementException()
+            @Suppress("UNCHECKED_CAST")
             val result = nextItem as T
 
             // Clean next to avoid keeping reference on yielded instance
@@ -466,6 +468,7 @@ internal class DropWhileSequence<T>
                 drop()
 
             if (dropState == 1) {
+                @Suppress("UNCHECKED_CAST")
                 val result = nextItem as T
                 nextItem = null
                 dropState = 0

libraries/stdlib/src/kotlin/coroutines/experimental/CoroutinesLibrary.kt

@@ -100,6 +100,7 @@ internal inline fun processBareContinuationResume(completion: Continuation<*>, b
     try {
         val result = block()
         if (result !== COROUTINE_SUSPENDED) {
+            @Suppress("UNCHECKED_CAST")
             (completion as Continuation<Any?>).resume(result)
         }
     } catch (t: Throwable) {

libraries/stdlib/src/kotlin/coroutines/experimental/SequenceBuilder.kt

@@ -138,6 +138,7 @@ private class SequenceBuilderIterator<T> : SequenceBuilder<T>(), Iterator<T>, Co
             }
             State_Ready -> {
                 state = State_NotReady
+                @Suppress("UNCHECKED_CAST") 
                 val result = nextValue as T
                 nextValue = null
                 return result

libraries/stdlib/src/kotlin/coroutines/experimental/intrinsics/Intrinsics.kt

@@ -41,7 +41,9 @@ import kotlin.coroutines.experimental.processBareContinuationResume
  */
 @SinceKotlin("1.1")
 @kotlin.internal.InlineOnly
-public inline suspend fun <T> suspendCoroutineOrReturn(crossinline block: (Continuation<T>) -> Any?): T = null!!
+@Suppress("UNUSED_PARAMETER")
+public inline suspend fun <T> suspendCoroutineOrReturn(crossinline block: (Continuation<T>) -> Any?): T =
+        throw NotImplementedError("Implementation is intrinsic")
 
 /**
  * This value is used as a return value of [suspendCoroutineOrReturn] `block` argument to state that
@@ -69,6 +71,7 @@ public fun <T> (suspend () -> T).createCoroutineUnchecked(
 ): Continuation<Unit> =
         if (this !is kotlin.coroutines.experimental.jvm.internal.CoroutineImpl)
             buildContinuationByInvokeCall(completion) {
+                @Suppress("UNCHECKED_CAST")
                 (this as Function1<Continuation<T>, Any?>).invoke(completion)
             }
         else
@@ -92,6 +95,7 @@ public fun <R, T> (suspend R.() -> T).createCoroutineUnchecked(
 ): Continuation<Unit> =
         if (this !is kotlin.coroutines.experimental.jvm.internal.CoroutineImpl)
             buildContinuationByInvokeCall(completion) {
+                @Suppress("UNCHECKED_CAST")
                 (this as Function2<R, Continuation<T>, Any?>).invoke(receiver, completion)
             }
         else

libraries/stdlib/src/kotlin/io/files/Utils.kt

@@ -240,7 +240,7 @@ private class TerminateException(file: File) : FileSystemException(file) {}
 public fun File.copyRecursively(target: File,
                                 overwrite: Boolean = false,
                                 onError: (File, IOException) -> OnErrorAction =
-                                { file, exception -> throw exception }
+                                         { _, exception -> throw exception }
 ): Boolean {
     if (!exists()) {
         return onError(this, NoSuchFileException(file = this, reason = "The source file doesn't exist.")) !=

libraries/stdlib/src/kotlin/text/Char.kt

@@ -36,11 +36,11 @@ public inline operator fun Char.plus(other: String) : String = this.toString() +
  *   - Applying the method [toLowerCase] to each character produces the same result
  */
 public fun Char.equals(other: Char, ignoreCase: Boolean = false): Boolean {
-    if (this === other) return true
+    if (this == other) return true
     if (!ignoreCase) return false
 
-    if (this.toUpperCase() === other.toUpperCase()) return true
+    if (this.toUpperCase() == other.toUpperCase()) return true
-    if (this.toLowerCase() === other.toLowerCase()) return true
+    if (this.toLowerCase() == other.toLowerCase()) return true
     return false
 }
 

libraries/stdlib/src/kotlin/text/Strings.kt

@@ -308,6 +308,7 @@ public fun CharSequence.subSequence(range: IntRange): CharSequence = subSequence
  * Replace parameter names with the same as those of [CharSequence.subSequence].
  */
 @kotlin.internal.InlineOnly
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER") // false warning
 @Deprecated("Use parameters named startIndex and endIndex.", ReplaceWith("subSequence(startIndex = start, endIndex = end)"))
 public inline fun String.subSequence(start: Int, end: Int): CharSequence = subSequence(start, end)
 

libraries/stdlib/src/kotlin/util/Exceptions.kt

@@ -11,18 +11,21 @@ import kotlin.internal.*
 /**
  * Prints the stack trace of this throwable to the standard output.
  */
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER") // to be used when no member available
 @kotlin.internal.InlineOnly
 public inline fun Throwable.printStackTrace(): Unit = (this as java.lang.Throwable).printStackTrace()
 
 /**
  * Prints the stack trace of this throwable to the specified [writer].
  */
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER") // to be used when no member available
 @kotlin.internal.InlineOnly
 public inline fun Throwable.printStackTrace(writer: PrintWriter): Unit = (this as java.lang.Throwable).printStackTrace(writer)
 
 /**
  * Prints the stack trace of this throwable to the specified [stream].
  */
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER") // to be used when no member available
 @kotlin.internal.InlineOnly
 public inline fun Throwable.printStackTrace(stream: PrintStream): Unit = (this as java.lang.Throwable).printStackTrace(stream)
 

libraries/tools/kotlin-stdlib-gen/src/templates/Elements.kt

@@ -33,6 +33,7 @@ fun elements(): List<GenericFunction> {
         only(Iterables, Sequences, ArraysOfObjects, ArraysOfPrimitives, Lists)
         doc { f -> "Returns first index of [element], or -1 if the ${f.collection} does not contain element." }
         typeParam("@kotlin.internal.OnlyInputTypes T")
+        annotations(Lists) { """@Suppress("EXTENSION_SHADOWED_BY_MEMBER") // false warning, extension takes precedence in some cases""" }
         returns("Int")
         body { f ->
             """
@@ -82,6 +83,7 @@ fun elements(): List<GenericFunction> {
         only(Iterables, Sequences, ArraysOfObjects, ArraysOfPrimitives, Lists)
         doc { f -> "Returns last index of [element], or -1 if the ${f.collection} does not contain element." }
         typeParam("@kotlin.internal.OnlyInputTypes T")
+        annotations(Lists) { """@Suppress("EXTENSION_SHADOWED_BY_MEMBER") // false warning, extension takes precedence in some cases""" }
         returns("Int")
         body { f ->
             """
@@ -538,6 +540,7 @@ fun elements(): List<GenericFunction> {
                 }
             }
             if (!found) throw NoSuchElementException("${f.doc.collection.capitalize()} contains no ${f.doc.element} matching the predicate.")
+            @Suppress("UNCHECKED_CAST")
             return last as T
             """
         }
@@ -710,6 +713,7 @@ fun elements(): List<GenericFunction> {
                 }
             }
             if (!found) throw NoSuchElementException("${f.doc.collection.capitalize()} contains no ${f.doc.element} matching the predicate.")
+            @Suppress("UNCHECKED_CAST")
             return single as T
             """
         }

libraries/tools/kotlin-stdlib-gen/src/templates/SpecialJVM.kt

@@ -426,7 +426,10 @@ object CommonArrays {
         returns("Unit")
         inline(Platform.JVM, Inline.Only)
         body(Platform.JVM) {
-            "(this as Array<Any?>).sort()"
+            """
+            @Suppress("UNCHECKED_CAST")
+            (this as Array<Any?>).sort()
+            """
         }
         body(Platform.JS) {
             """