Fixed some warnings in stdlib (#420)

runtime/src/main/kotlin/konan/internal/Char.kt

@@ -33,10 +33,13 @@ 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 {
+    @Suppress("DEPRECATED_IDENTITY_EQUALS")
     if (this === other) return true
     if (!ignoreCase) return false
 
+    @Suppress("DEPRECATED_IDENTITY_EQUALS")
     if (this.toUpperCase() === other.toUpperCase()) return true
+    @Suppress("DEPRECATED_IDENTITY_EQUALS")
     if (this.toLowerCase() === other.toLowerCase()) return true
     return false
 }

runtime/src/main/kotlin/konan/internal/Intrinsics.kt

@@ -33,6 +33,7 @@ import kotlinx.cinterop.NativePtr
 @Intrinsic external fun areEqualByValue(first: NativePointed?, second: NativePointed?): Boolean
 @Intrinsic external fun areEqualByValue(first: CPointer<*>?, second: CPointer<*>?): Boolean
 
+@Suppress("NOTHING_TO_INLINE")
 inline fun areEqual(first: Any?, second: Any?): Boolean {
     return if (first == null) second == null else first.equals(second)
 }

runtime/src/main/kotlin/konan/internal/KPropertyImpl.kt

@@ -34,7 +34,7 @@ open class KProperty0Impl<out R>(override val name: String, val getter: () -> R)
     }
 
     override fun equals(other: Any?): Boolean {
-        val otherKProperty = other as? KProperty0Impl<R>
+        val otherKProperty = other as? KProperty0Impl<*>
         if (otherKProperty == null) return false
         return name == otherKProperty.name && getter == otherKProperty.getter
     }
@@ -58,7 +58,7 @@ open class KProperty1Impl<T, out R>(override val name: String, val getter: (T) -
     }
 
     override fun equals(other: Any?): Boolean {
-        val otherKProperty = other as? KProperty1Impl<T, R>
+        val otherKProperty = other as? KProperty1Impl<*, *>
         if (otherKProperty == null) return false
         return name == otherKProperty.name && getter == otherKProperty.getter
     }
@@ -82,7 +82,7 @@ open class KProperty2Impl<T1, T2, out R>(override val name: String, val getter:
     }
 
     override fun equals(other: Any?): Boolean {
-        val otherKProperty = other as? KProperty2Impl<T1, T2, R>
+        val otherKProperty = other as? KProperty2Impl<*, *, *>
         if (otherKProperty == null) return false
         return name == otherKProperty.name && getter == otherKProperty.getter
     }
@@ -104,7 +104,7 @@ class KMutableProperty0Impl<R>(name: String, getter: () -> R, val setter: (R) ->
     }
 
     override fun equals(other: Any?): Boolean {
-        val otherKProperty = other as? KMutableProperty0Impl<R>
+        val otherKProperty = other as? KMutableProperty0Impl<*>
         if (otherKProperty == null) return false
         return name == otherKProperty.name && getter == otherKProperty.getter && setter == otherKProperty.setter
     }
@@ -126,7 +126,7 @@ class KMutableProperty1Impl<T, R>(name: String, getter: (T) -> R, val setter: (T
     }
 
     override fun equals(other: Any?): Boolean {
-        val otherKProperty = other as? KMutableProperty1Impl<T, R>
+        val otherKProperty = other as? KMutableProperty1Impl<*, *>
         if (otherKProperty == null) return false
         return name == otherKProperty.name && getter == otherKProperty.getter && setter == otherKProperty.setter
     }
@@ -148,7 +148,7 @@ class KMutableProperty2Impl<T1, T2, R>(name: String, getter: (T1, T2) -> R, val
     }
 
     override fun equals(other: Any?): Boolean {
-        val otherKProperty = other as? KMutableProperty2Impl<T1, T2, R>
+        val otherKProperty = other as? KMutableProperty2Impl<* ,*, *>
         if (otherKProperty == null) return false
         return name == otherKProperty.name && getter == otherKProperty.getter && setter == otherKProperty.setter
     }

runtime/src/main/kotlin/konan/internal/RuntimeUtils.kt

@@ -77,5 +77,6 @@ fun <T: Enum<T>> valuesForEnum(values: Array<T>): Array<T>
     val result = Array<T?>(values.size)
     for (value in values)
         result[value.ordinal] = value
+    @Suppress("UNCHECKED_CAST")
     return result as Array<T>
 }

runtime/src/main/kotlin/konan/internal/Strings.kt

@@ -169,6 +169,7 @@ external public fun String.toUpperCase(): String
  * Returns a copy of this string converted to lower case using the rules of the default locale.
  */
 @SymbolName("Kotlin_String_toLowerCase")
+@Suppress("NOTHING_TO_INLINE")
 external public inline fun String.toLowerCase(): String
 
 /**

runtime/src/main/kotlin/kotlin/Arrays.kt

@@ -2583,56 +2583,67 @@ public inline fun <reified T> Collection<T>.toTypedArray(): Array<T> {
     val result = arrayOfNulls<T>(size)
     var index = 0
     for (element in this) result[index++] = element
+    @Suppress("UNCHECKED_CAST")
     return result as Array<T>
 }
 
 /**
  * Returns an array containing the specified elements.
  */
+@Suppress("UNCHECKED_CAST")
 public inline fun <reified @PureReifiable T> arrayOf(vararg elements: T): Array<T> = elements as Array<T>
 
 private val kEmptyArray = arrayOf<Any>()
 
+@Suppress("UNCHECKED_CAST")
 public fun <T> emptyArray() = kEmptyArray as Array<T>
 
 /**
  * Returns an array containing the specified [Double] numbers.
  */
+@Suppress("NOTHING_TO_INLINE")
 public inline fun doubleArrayOf(vararg elements: Double) = elements
 
 /**
  * Returns an array containing the specified [Float] numbers.
  */
+@Suppress("NOTHING_TO_INLINE")
 public inline fun floatArrayOf(vararg elements: Float) = elements
 
 /**
  * Returns an array containing the specified [Long] numbers.
  */
+@Suppress("NOTHING_TO_INLINE")
 public inline fun longArrayOf(vararg elements: Long) = elements
 
 /**
  * Returns an array containing the specified [Int] numbers.
  */
+@Suppress("NOTHING_TO_INLINE")
 public inline fun intArrayOf(vararg elements: Int) = elements
 
 /**
  * Returns an array containing the specified characters.
  */
+@Suppress("NOTHING_TO_INLINE")
 public inline fun charArrayOf(vararg elements: Char) = elements
 
 /**
  * Returns an array containing the specified [Short] numbers.
  */
+@Suppress("NOTHING_TO_INLINE")
 public inline fun shortArrayOf(vararg elements: Short) = elements
 
 /**
  * Returns an array containing the specified [Byte] numbers.
  */
+@Suppress("NOTHING_TO_INLINE")
 public inline fun byteArrayOf(vararg elements: Byte) = elements
 
 /**
  * Returns an array containing the specified boolean values.
  */
+@Suppress("NOTHING_TO_INLINE")
 public inline fun booleanArrayOf(vararg elements: Boolean) = elements
 
 /**

runtime/src/main/kotlin/kotlin/Assertions.kt

@@ -20,6 +20,7 @@ package kotlin
  * Throws an [AssertionError] if the [value] is false
  * and runtime assertions have been enabled during compilation.
  */
+@Suppress("NOTHING_TO_INLINE")
 public inline fun assert(value: Boolean) {
     assert(value) { "Assertion failed" }
 }

runtime/src/main/kotlin/kotlin/Enum.kt

@@ -48,6 +48,7 @@ public abstract class Enum<E: Enum<E>>(public val name: String, public val ordin
     }
 }
 
+@Suppress("UNUSED_PARAMETER")
 fun <T: Enum<T>> enumValueOf(name: String): T {
     throw Exception("Call to this function should've been lowered")
 }

runtime/src/main/kotlin/kotlin/Lazy.kt

@@ -83,6 +83,7 @@ public fun <T> lazy(mode: LazyThreadSafetyMode, initializer: () -> T): Lazy<T> =
  * Also this behavior can be changed in the future.
  */
 @FixmeConcurrency
+@Suppress("UNUSED_PARAMETER")
 public fun <T> lazy(lock: Any?, initializer: () -> T): Lazy<T> = TODO()//SynchronizedLazyImpl(initializer, lock)
 
 /**

runtime/src/main/kotlin/kotlin/Primitives.kt

@@ -154,22 +154,22 @@ public final class Byte : Number(), Comparable<Byte> {
 
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Byte_mod_Byte")
-    external public operator fun mod(other: Byte): Int
+    external public operator fun rem(other: Byte): Int
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Byte_mod_Short")
-    external public operator fun mod(other: Short): Int
+    external public operator fun rem(other: Short): Int
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Byte_mod_Int")
-    external public operator fun mod(other: Int): Int
+    external public operator fun rem(other: Int): Int
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Byte_mod_Long")
-    external public operator fun mod(other: Long): Long
+    external public operator fun rem(other: Long): Long
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Byte_mod_Float")
-    external public operator fun mod(other: Float): Float
+    external public operator fun rem(other: Float): Float
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Byte_mod_Double")
-    external public operator fun mod(other: Double): Double
+    external public operator fun rem(other: Double): Double
 
     /** Increments this value. */
     @SymbolName("Kotlin_Byte_inc")
@@ -381,22 +381,22 @@ public final class Short : Number(), Comparable<Short> {
 
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Short_mod_Byte")
-    external public operator fun mod(other: Byte): Int
+    external public operator fun rem(other: Byte): Int
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Short_mod_Short")
-    external public operator fun mod(other: Short): Int
+    external public operator fun rem(other: Short): Int
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Short_mod_Int")
-    external public operator fun mod(other: Int): Int
+    external public operator fun rem(other: Int): Int
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Short_mod_Long")
-    external public operator fun mod(other: Long): Long
+    external public operator fun rem(other: Long): Long
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Short_mod_Float")
-    external public operator fun mod(other: Float): Float
+    external public operator fun rem(other: Float): Float
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Short_mod_Double")
-    external public operator fun mod(other: Double): Double
+    external public operator fun rem(other: Double): Double
 
     /** Increments this value. */
     @SymbolName("Kotlin_Short_inc")
@@ -608,22 +608,22 @@ public final class Int : Number(), Comparable<Int> {
 
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Int_mod_Byte")
-    external public operator fun mod(other: Byte): Int
+    external public operator fun rem(other: Byte): Int
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Int_mod_Short")
-    external public operator fun mod(other: Short): Int
+    external public operator fun rem(other: Short): Int
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Int_mod_Int")
-    external public operator fun mod(other: Int): Int
+    external public operator fun rem(other: Int): Int
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Int_mod_Long")
-    external public operator fun mod(other: Long): Long
+    external public operator fun rem(other: Long): Long
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Int_mod_Float")
-    external public operator fun mod(other: Float): Float
+    external public operator fun rem(other: Float): Float
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Int_mod_Double")
-    external public operator fun mod(other: Double): Double
+    external public operator fun rem(other: Double): Double
 
     /** Increments this value. */
     @SymbolName("Kotlin_Int_inc")
@@ -704,33 +704,6 @@ public final class Int : Number(), Comparable<Int> {
     public override fun hashCode(): Int {
         return this
     }
-
-    // TODO: make extensions.
-    fun highestOneBit() : Int {
-        var index = 31
-
-        while (index >= 0) {
-            var mask = (1 shl index)
-            if ((mask and this) != 0) {
-                return mask
-            }
-            index--
-        }
-        return 0
-    }
-
-    fun numberOfLeadingZeros() : Int {
-        var index = 31
-
-        while (index >= 0) {
-            var mask = (1 shl index)
-            if ((mask and this) != 0) {
-                return 31 - index
-            }
-            index--
-        }
-        return 0
-    }
 }
 
 /**
@@ -871,22 +844,22 @@ public final class Long : Number(), Comparable<Long> {
 
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Long_mod_Byte")
-    external public operator fun mod(other: Byte): Long
+    external public operator fun rem(other: Byte): Long
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Long_mod_Short")
-    external public operator fun mod(other: Short): Long
+    external public operator fun rem(other: Short): Long
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Long_mod_Int")
-    external public operator fun mod(other: Int): Long
+    external public operator fun rem(other: Int): Long
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Long_mod_Long")
-    external public operator fun mod(other: Long): Long
+    external public operator fun rem(other: Long): Long
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Long_mod_Float")
-    external public operator fun mod(other: Float): Float
+    external public operator fun rem(other: Float): Float
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Long_mod_Double")
-    external public operator fun mod(other: Double): Double
+    external public operator fun rem(other: Double): Double
 
     /** Increments this value. */
     @SymbolName("Kotlin_Long_inc")
@@ -988,16 +961,19 @@ public final class Float : Number(), Comparable<Float> {
         /**
          * A constant holding the positive infinity value of Float.
          */
+        @Suppress("DIVISION_BY_ZERO")
         public val POSITIVE_INFINITY: Float = 1.0f / 0.0f
 
         /**
          * A constant holding the negative infinity value of Float.
          */
+        @Suppress("DIVISION_BY_ZERO")
         public val NEGATIVE_INFINITY: Float = -1.0f / 0.0f
 
         /**
          * A constant holding the "not a number" value of Float.
          */
+        @Suppress("DIVISION_BY_ZERO")
         public val NaN: Float = 0.0f / 0.0f
     }
 
@@ -1122,22 +1098,22 @@ public final class Float : Number(), Comparable<Float> {
 
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Float_mod_Byte")
-    external public operator fun mod(other: Byte): Float
+    external public operator fun rem(other: Byte): Float
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Float_mod_Short")
-    external public operator fun mod(other: Short): Float
+    external public operator fun rem(other: Short): Float
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Float_mod_Int")
-    external public operator fun mod(other: Int): Float
+    external public operator fun rem(other: Int): Float
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Float_mod_Long")
-    external public operator fun mod(other: Long): Float
+    external public operator fun rem(other: Long): Float
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Float_mod_Float")
-    external public operator fun mod(other: Float): Float
+    external public operator fun rem(other: Float): Float
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Float_mod_Double")
-    external public operator fun mod(other: Double): Double
+    external public operator fun rem(other: Double): Double
 
     /** Increments this value. */
     @SymbolName("Kotlin_Float_inc")
@@ -1205,16 +1181,19 @@ public final class Double : Number(), Comparable<Double> {
         /**
          * A constant holding the positive infinity value of Double.
          */
+        @Suppress("DIVISION_BY_ZERO")
         public val POSITIVE_INFINITY: Double = 1.0 / 0.0
 
         /**
          * A constant holding the negative infinity value of Double.
          */
+        @Suppress("DIVISION_BY_ZERO")
         public val NEGATIVE_INFINITY: Double = -1.0 / 0.0
 
         /**
          * A constant holding the "not a number" value of Double.
          */
+        @Suppress("DIVISION_BY_ZERO")
         public val NaN: Double = 0.0 / 0.0
     }
 
@@ -1339,22 +1318,22 @@ public final class Double : Number(), Comparable<Double> {
 
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Double_mod_Byte")
-    external public operator fun mod(other: Byte): Double
+    external public operator fun rem(other: Byte): Double
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Double_mod_Short")
-    external public operator fun mod(other: Short): Double
+    external public operator fun rem(other: Short): Double
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Double_mod_Int")
-    external public operator fun mod(other: Int): Double
+    external public operator fun rem(other: Int): Double
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Double_mod_Long")
-    external public operator fun mod(other: Long): Double
+    external public operator fun rem(other: Long): Double
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Double_mod_Float")
-    external public operator fun mod(other: Float): Double
+    external public operator fun rem(other: Float): Double
     /** Calculates the remainder of dividing this value by the other value. */
     @SymbolName("Kotlin_Double_mod_Double")
-    external public operator fun mod(other: Double): Double
+    external public operator fun rem(other: Double): Double
 
     /** Increments this value. */
     @SymbolName("Kotlin_Double_inc")

runtime/src/main/kotlin/kotlin/Throwable.kt

@@ -42,6 +42,7 @@ public open class Throwable(open val message: String?, open val cause: Throwable
         this.cause?.printEnclosedStackTrace(this)
     }
 
+    @Suppress("UNUSED_PARAMETER")
     private fun printEnclosedStackTrace(enclosing: Throwable) {
         // TODO: should skip common stack frames
         print("Caused by: ")

runtime/src/main/kotlin/kotlin/collections/Collections.kt

@@ -128,6 +128,7 @@ public inline fun <T> List<T>?.orEmpty(): List<T> = this ?: emptyList()
  * Allows to overcome type-safety restriction of `containsAll` that requires to pass a collection of type `Collection<E>`.
  */
 @kotlin.internal.InlineOnly
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER")
 public inline fun <@kotlin.internal.OnlyInputTypes T> Collection<T>.containsAll(
         elements: Collection<T>): Boolean = this.containsAll(elements)
 
@@ -555,6 +556,7 @@ 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")
 public fun <@kotlin.internal.OnlyInputTypes T> List<T>.indexOf(element: T): Int {
     return indexOf(element)
 }
@@ -674,6 +676,7 @@ public inline fun <T> List<T>.last(predicate: (T) -> Boolean): T {
 /**
  * Returns last index of [element], or -1 if the collection does not contain element.
  */
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER")
 public fun <@kotlin.internal.OnlyInputTypes T> Iterable<T>.lastIndexOf(element: T): Int {
     if (this is List) return this.lastIndexOf(element)
     var lastIndex = -1
@@ -689,6 +692,7 @@ 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")
 public fun <@kotlin.internal.OnlyInputTypes T> List<T>.lastIndexOf(element: T): Int {
     return lastIndexOf(element)
 }
@@ -2192,6 +2196,7 @@ public infix fun <T, R> Iterable<T>.zip(other: Array<out R>): List<Pair<T, R>> {
     return zip(other) { t1, t2 -> t1 to t2 }
 }
 
+@Suppress("NOTHING_TO_INLINE")
 inline fun min(x1: Int, x2: Int) = if (x1 < x2) x1 else x2
 
 /**

runtime/src/main/kotlin/kotlin/collections/Maps.kt

@@ -38,6 +38,7 @@ private object EmptyMap : Map<Any?, Nothing> {
  * Returns an empty read-only map of specified type. The returned map is serializable (JVM).
  * @sample samples.collections.Maps.Instantiation.emptyReadOnlyMap
  */
+@Suppress("UNCHECKED_CAST")
 public fun <K, V> emptyMap(): Map<K, V> = EmptyMap as Map<K, V>
 
 /**
@@ -162,6 +163,7 @@ 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`.
  */
 @kotlin.internal.InlineOnly
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER")
 public inline fun <K, @kotlin.internal.OnlyInputTypes V> Map<K, V>.containsValue(value: V): Boolean = this.containsValue(value)
 
 

runtime/src/main/kotlin/kotlin/sequences/Sequences.kt

@@ -952,6 +952,7 @@ public inline fun <reified R> Sequence<*>.filterIsInstance(): Sequence<@kotlin.i
  * Appends all elements that are instances of specified type parameter R to the given [destination].
  */
 @FixmeReified
+@Suppress("UNUSED_PARAMETER")
 public inline fun <reified R, C : MutableCollection<in R>> Sequence<*>.filterIsInstanceTo(destination: C): C {
     //for (element in this) if (element is R) destination.add(element)
     //return destination

runtime/src/main/kotlin/kotlin/text/Appendable.kt

@@ -52,7 +52,7 @@ public fun StringBuilder.append(vararg value: Any?): StringBuilder {
 internal fun <T> Appendable.appendElement(element: T, transform: ((T) -> CharSequence)?) {
     when {
         transform != null -> append(transform(element))
-        element is CharSequence? -> append(element)
+        element is CharSequence -> append(element)
         element is Char -> append(element)
         else -> append(element.toString())
     }

runtime/src/main/kotlin/kotlin/text/Char.kt

@@ -51,6 +51,7 @@ external public fun Char.isIdentifierIgnorable(): Boolean
  * Returns `true` if this character is an ISO control character.
  */
 @SymbolName("Kotlin_Char_isISOControl")
+@Suppress("NOTHING_TO_INLINE")
 external public inline fun Char.isISOControl(): Boolean
 
 /**

runtime/src/main/kotlin/kotlin/text/Strings.kt

@@ -304,6 +304,7 @@ public fun CharSequence.subSequence(range: IntRange): CharSequence = subSequence
  */
 @kotlin.internal.InlineOnly
 @Deprecated("Use parameters named startIndex and endIndex.", ReplaceWith("subSequence(startIndex = start, endIndex = end)"))
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER")
 public inline fun String.subSequence(start: Int, end: Int): CharSequence = subSequence(start, end)
 
 /**
@@ -714,7 +715,7 @@ public fun CharSequence.endsWith(char: Char, ignoreCase: Boolean = false): Boole
  */
 public fun CharSequence.startsWith(prefix: CharSequence, ignoreCase: Boolean = false): Boolean {
     if (!ignoreCase && this is String && prefix is String)
-        return (this as String).startsWith(prefix)
+        return this.startsWith(prefix)
     else
         return regionMatchesImpl(0, prefix, 0, prefix.length, ignoreCase)
 }
@@ -724,7 +725,7 @@ public fun CharSequence.startsWith(prefix: CharSequence, ignoreCase: Boolean = f
  */
 public fun CharSequence.startsWith(prefix: CharSequence, startIndex: Int, ignoreCase: Boolean = false): Boolean {
     if (!ignoreCase && this is String && prefix is String)
-        return (this as String).startsWith(prefix, startIndex)
+        return this.startsWith(prefix, startIndex)
     else
         return regionMatchesImpl(startIndex, prefix, 0, prefix.length, ignoreCase)
 }
@@ -734,7 +735,7 @@ public fun CharSequence.startsWith(prefix: CharSequence, startIndex: Int, ignore
  */
 public fun CharSequence.endsWith(suffix: CharSequence, ignoreCase: Boolean = false): Boolean {
     if (!ignoreCase && this is String && suffix is String)
-        return (this as String).endsWith(suffix)
+        return this.endsWith(suffix)
     else
         return regionMatchesImpl(length - suffix.length, suffix, 0, suffix.length, ignoreCase)
 }

runtime/src/main/kotlin/kotlin/util/Sort.kt

@@ -22,6 +22,7 @@ import kotlin.comparisons.*
 private fun <T> partition(array: Array<T>, left: Int, right: Int): Int {
     var i = left
     var j = right
+    @Suppress("UNCHECKED_CAST")
     val pivot = array[(left + right) / 2] as Comparable<T>
     while (i <= j) {
         while (pivot.compareTo(array[i]) > 0) {
@@ -81,9 +82,11 @@ private fun <T> quickSort(
 
 internal fun <T> sortArrayWith(
         array: Array<out T>, fromIndex: Int, toIndex: Int, comparator: Comparator<T>) {
+    @Suppress("UNCHECKED_CAST")
     quickSort(array as Array<T>, fromIndex, toIndex, comparator)
 }
 
 internal fun <T> sortArrayComparable(array: Array<out T>) {
+    @Suppress("UNCHECKED_CAST")
     quickSort(array as Array<T>, 0, array.size - 1)
 }