diff --git a/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/RedundantGotoMethodTransformer.kt b/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/RedundantGotoMethodTransformer.kt
index f28eacb676b..34a55ef4e07 100644
--- a/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/RedundantGotoMethodTransformer.kt
+++ b/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/RedundantGotoMethodTransformer.kt
@@ -33,7 +33,7 @@ public class RedundantGotoMethodTransformer : MethodTransformer() {
         val insnsToRemove = arrayListOf<AbstractInsnNode>()
 
         val currentLabels = hashSetOf<LabelNode>()
-        for (insn in insns.reverse()) {
+        for (insn in insns.reversed()) {
             if (insn.isMeaningful) {
                 if (insn.getOpcode() == Opcodes.GOTO && (insn as JumpInsnNode).label in currentLabels) {
                     insnsToRemove.add(insn)
diff --git a/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/fixStack/StackTransformationUtils.kt b/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/fixStack/StackTransformationUtils.kt
index 01541346128..bb8819f872f 100644
--- a/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/fixStack/StackTransformationUtils.kt
+++ b/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/fixStack/StackTransformationUtils.kt
@@ -111,7 +111,7 @@ fun generateLoadInstructions(methodNode: MethodNode, location: AbstractInsnNode,
 
 fun generateStoreInstructions(methodNode: MethodNode, location: AbstractInsnNode, savedStackDescriptor: SavedStackDescriptor) {
     var localVarIndex = savedStackDescriptor.firstUnusedLocalVarIndex
-    for (value in savedStackDescriptor.savedValues.reverse()) {
+    for (value in savedStackDescriptor.savedValues.asReversed()) {
         localVarIndex -= value.getSize()
         methodNode.instructions.insertBefore(location,
                                              VarInsnNode(value.getType().getOpcode(Opcodes.ISTORE), localVarIndex))
diff --git a/compiler/container/src/org/jetbrains/kotlin/container/DataStructures.kt b/compiler/container/src/org/jetbrains/kotlin/container/DataStructures.kt
index 83d71231c72..2d1c876abf7 100644
--- a/compiler/container/src/org/jetbrains/kotlin/container/DataStructures.kt
+++ b/compiler/container/src/org/jetbrains/kotlin/container/DataStructures.kt
@@ -45,7 +45,7 @@ public fun topologicalSort<T>(items: Iterable<T>, dependencies: (T) -> Iterable<
     for (item in items)
         DfsVisit(item)
 
-    return result.reverse()
+    return result.reversed()
 }
 
 public class CycleInTopoSortException : Exception()
\ No newline at end of file
diff --git a/compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/CallCompleter.kt b/compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/CallCompleter.kt
index ae690dcf793..13b7fed6297 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/CallCompleter.kt
+++ b/compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/CallCompleter.kt
@@ -312,7 +312,7 @@ public class CallCompleter(
         }
 
         var shouldBeMadeNullable: Boolean = false
-        expressions.reverse().forEach { expression ->
+        expressions.asReversed().forEach { expression ->
             if (!(expression is JetParenthesizedExpression || expression is JetLabeledExpression || expression is JetAnnotatedExpression)) {
                 shouldBeMadeNullable = hasNecessarySafeCall(expression, trace)
             }
diff --git a/core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRendererImpl.kt b/core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRendererImpl.kt
index 0091d2c079c..f0090f46b95 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRendererImpl.kt
+++ b/core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRendererImpl.kt
@@ -135,7 +135,7 @@ internal class DescriptorRendererImpl(
                 }
                 while (current is ClassDescriptor)
 
-                return renderFqName(qualifiedNameElements.reverse())
+                return renderFqName(qualifiedNameElements.asReversed())
             }
 
             NameShortness.FULLY_QUALIFIED -> return renderFqName(DescriptorUtils.getFqName(klass))
diff --git a/core/util.runtime/src/org/jetbrains/kotlin/utils/addToStdlib.kt b/core/util.runtime/src/org/jetbrains/kotlin/utils/addToStdlib.kt
index f432df8f067..536bd89e706 100644
--- a/core/util.runtime/src/org/jetbrains/kotlin/utils/addToStdlib.kt
+++ b/core/util.runtime/src/org/jetbrains/kotlin/utils/addToStdlib.kt
@@ -68,7 +68,7 @@ public inline fun <reified T : Any> Iterable<*>.lastIsInstanceOrNull(): T? {
         }
 
         else -> {
-            return reverse().firstIsInstanceOrNull<T>()
+            return reversed().firstIsInstanceOrNull<T>()
         }
     }
 }
diff --git a/idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/KotlinCompletionContributor.kt b/idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/KotlinCompletionContributor.kt
index b42ae6bd574..12f245a32c0 100644
--- a/idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/KotlinCompletionContributor.kt
+++ b/idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/KotlinCompletionContributor.kt
@@ -193,7 +193,7 @@ public class KotlinCompletionContributor : CompletionContributor() {
             if (tokenType in declarationKeywords) {
                 val balance = ltCount - gtCount
                 if (balance < 0) return null
-                builder.append(token.getText()!!.reverse())
+                builder.append(token.getText()!!.reversed())
                 builder.reverse()
 
                 var tail = "X" + ">".repeat(balance) + ".f"
@@ -212,7 +212,7 @@ public class KotlinCompletionContributor : CompletionContributor() {
             if (tokenType !in declarationTokens) return null
             if (tokenType == JetTokens.LT) ltCount++
             if (tokenType == JetTokens.GT) gtCount++
-            builder.append(token.getText()!!.reverse())
+            builder.append(token.getText()!!.reversed())
             token = PsiTreeUtil.prevLeaf(token) ?: return null
         }
     }
diff --git a/idea/idea-core/src/org/jetbrains/kotlin/idea/core/CommentSaver.kt b/idea/idea-core/src/org/jetbrains/kotlin/idea/core/CommentSaver.kt
index 4583870720c..e856a3c5a96 100644
--- a/idea/idea-core/src/org/jetbrains/kotlin/idea/core/CommentSaver.kt
+++ b/idea/idea-core/src/org/jetbrains/kotlin/idea/core/CommentSaver.kt
@@ -340,7 +340,7 @@ public class CommentSaver(originalElements: PsiChildRange, private val saveLineB
             for (leaf in lineBreakElement.prevLeafs) {
                 var psiElement = findRestored(leaf)
                 if (psiElement != null) {
-                    psiElement = skipTokensForward(psiElement, tokensToMatch.reverse())
+                    psiElement = skipTokensForward(psiElement, tokensToMatch.asReversed())
                     psiElement?.restoreLineBreakAfter()
                     break
                 }
@@ -425,7 +425,7 @@ public class CommentSaver(originalElements: PsiChildRange, private val saveLineB
         }
 
         var psiElement = anchor.element
-        for (token in tokensBetween.reverse()) {
+        for (token in tokensBetween.asReversed()) {
             val next = psiElement.next() ?: break
             if (next.tokenType != token.tokenType) break
             psiElement = next
diff --git a/idea/idea-core/src/org/jetbrains/kotlin/idea/core/OptionalParametersHelper.kt b/idea/idea-core/src/org/jetbrains/kotlin/idea/core/OptionalParametersHelper.kt
index 1074ecd7671..1f2d8ade4bd 100644
--- a/idea/idea-core/src/org/jetbrains/kotlin/idea/core/OptionalParametersHelper.kt
+++ b/idea/idea-core/src/org/jetbrains/kotlin/idea/core/OptionalParametersHelper.kt
@@ -55,7 +55,7 @@ public object OptionalParametersHelper {
 
         val arguments = resolvedCall.getCall().getValueArgumentsInParentheses()
         val argumentsToDrop = ArrayList<ValueArgument>()
-        for (argument in arguments.reverse()) {
+        for (argument in arguments.asReversed()) {
             if (!canDrop(argument) || !argument.matchesDefault(resolvedCall, parameterToDefaultValue)) {
                 if (!argument.isNamed()) break else continue // for a named argument we can try to drop arguments before it as well
             }
diff --git a/idea/src/org/jetbrains/kotlin/idea/conversion/copy/DataForConversion.kt b/idea/src/org/jetbrains/kotlin/idea/conversion/copy/DataForConversion.kt
index 46c4c81b15c..194b4a4c84c 100644
--- a/idea/src/org/jetbrains/kotlin/idea/conversion/copy/DataForConversion.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/conversion/copy/DataForConversion.kt
@@ -109,7 +109,7 @@ data class DataForConversion private constructor(
             }.toString()
 
             fun IntArray.update() {
-                for (range in rangesToDrop.reverse()) {
+                for (range in rangesToDrop.asReversed()) {
                     for (i in indices) {
                         val offset = this[i]
                         if (offset >= range.end) {
diff --git a/idea/src/org/jetbrains/kotlin/idea/editor/wordSelection/KotlinCodeBlockSelectioner.kt b/idea/src/org/jetbrains/kotlin/idea/editor/wordSelection/KotlinCodeBlockSelectioner.kt
index 6f68abd4b00..ffcfbdb295c 100644
--- a/idea/src/org/jetbrains/kotlin/idea/editor/wordSelection/KotlinCodeBlockSelectioner.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/editor/wordSelection/KotlinCodeBlockSelectioner.kt
@@ -64,7 +64,7 @@ public class KotlinCodeBlockSelectioner : ExtendWordSelectionHandlerBase() {
     private fun findBlockContentEnd(block: PsiElement): Int {
         val element = block.allChildren
                            .toList()
-                           .reverse()
+                           .asReversed()
                            .asSequence()
                            .dropWhile { it.getNode().getElementType() != JetTokens.RBRACE } // search for '}'
                            .drop(1) // skip it
diff --git a/idea/src/org/jetbrains/kotlin/idea/intentions/ConvertNegatedExpressionWithDemorgansLawIntention.kt b/idea/src/org/jetbrains/kotlin/idea/intentions/ConvertNegatedExpressionWithDemorgansLawIntention.kt
index 484adac36be..a5ab6d3c865 100644
--- a/idea/src/org/jetbrains/kotlin/idea/intentions/ConvertNegatedExpressionWithDemorgansLawIntention.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/intentions/ConvertNegatedExpressionWithDemorgansLawIntention.kt
@@ -51,7 +51,7 @@ public class ConvertNegatedExpressionWithDemorgansLawIntention : JetSelfTargetin
             else -> throw IllegalArgumentException()
         }
 
-        val operands = splitBooleanSequence(baseExpression)!!.reverse()
+        val operands = splitBooleanSequence(baseExpression)!!.asReversed()
 
         val newExpression = JetPsiFactory(element).buildExpression {
             for ((i, operand) in operands.withIndex()) {
diff --git a/idea/src/org/jetbrains/kotlin/idea/quickfix/createFromUsage/callableBuilder/CallableBuilder.kt b/idea/src/org/jetbrains/kotlin/idea/quickfix/createFromUsage/callableBuilder/CallableBuilder.kt
index efb3ff7ecaa..f1e7fd22705 100644
--- a/idea/src/org/jetbrains/kotlin/idea/quickfix/createFromUsage/callableBuilder/CallableBuilder.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/quickfix/createFromUsage/callableBuilder/CallableBuilder.kt
@@ -163,7 +163,7 @@ class CallableBuilder(val config: CallableBuilderConfiguration) {
             scope: JetScope): List<TypeCandidate> {
         if (!typeInfo.substitutionsAllowed) return computeTypeCandidates(typeInfo)
         return typeCandidates.getOrPut(typeInfo) {
-            val types = typeInfo.getPossibleTypes(this).reverse()
+            val types = typeInfo.getPossibleTypes(this).asReversed()
 
             // We have to use semantic equality here
             data class EqWrapper(val _type: JetType) {
@@ -187,7 +187,7 @@ class CallableBuilder(val config: CallableBuilderConfiguration) {
                 newTypes.add(EqWrapper(currentFileModule.builtIns.anyType))
             }
 
-            newTypes.map { TypeCandidate(it._type, scope) }.reverse()
+            newTypes.map { TypeCandidate(it._type, scope) }.reversed()
         }
     }
 
diff --git a/idea/src/org/jetbrains/kotlin/idea/refactoring/pullUp/KotlinPullUpHelperFactory.kt b/idea/src/org/jetbrains/kotlin/idea/refactoring/pullUp/KotlinPullUpHelperFactory.kt
index 6e2d8dee2c7..95d07a4e849 100644
--- a/idea/src/org/jetbrains/kotlin/idea/refactoring/pullUp/KotlinPullUpHelperFactory.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/refactoring/pullUp/KotlinPullUpHelperFactory.kt
@@ -79,7 +79,7 @@ public class JavaToKotlinPullUpHelperFactory : PullUpHelperFactory {
         val elementFactory = PsiElementFactory.SERVICE.getInstance(project)
 
         val dummyTargetClass = createJavaClass(targetClass, null, forcePlainClass = true)
-        val outerClasses = targetClass.parents.filterIsInstance<JetClassOrObject>().toList().reverse()
+        val outerClasses = targetClass.parents.filterIsInstance<JetClassOrObject>().toList().asReversed()
 
         if (outerClasses.isEmpty()) return dummyFile.add(dummyTargetClass) as PsiClass
 
diff --git a/idea/src/org/jetbrains/kotlin/idea/util/ImportInsertHelperImpl.kt b/idea/src/org/jetbrains/kotlin/idea/util/ImportInsertHelperImpl.kt
index b6eb71252e5..292c4c131ef 100644
--- a/idea/src/org/jetbrains/kotlin/idea/util/ImportInsertHelperImpl.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/util/ImportInsertHelperImpl.kt
@@ -380,8 +380,7 @@ public class ImportInsertHelperImpl(private val project: Project) : ImportInsert
                 }
                 else {
                     val insertAfter = imports
-                            .reverse()
-                            .firstOrNull {
+                            .lastOrNull {
                                 val directivePath = it.getImportPath()
                                 directivePath != null && ImportPathComparator.compare(directivePath, importPath) <= 0
                             }
diff --git a/j2k/src/org/jetbrains/kotlin/j2k/CodeBuilder.kt b/j2k/src/org/jetbrains/kotlin/j2k/CodeBuilder.kt
index 197cfba85c3..2b57bd2c780 100644
--- a/j2k/src/org/jetbrains/kotlin/j2k/CodeBuilder.kt
+++ b/j2k/src/org/jetbrains/kotlin/j2k/CodeBuilder.kt
@@ -215,7 +215,7 @@ class CodeBuilder(private val topElement: PsiElement?, private var docConverter:
             before.remove(before.lastIndex)
         }
 
-        val elements = before.reverse() + atStart
+        val elements = before.reversed() + atStart
         commentsAndSpacesUsed.addAll(elements)
         return Prefix(elements, lineBreaks)
     }
@@ -238,7 +238,7 @@ class CodeBuilder(private val topElement: PsiElement?, private var docConverter:
             }
         }
 
-        val result = atEnd.reverse() + after
+        val result = atEnd.reversed() + after
         commentsAndSpacesUsed.addAll(result)
         return result
     }
@@ -317,7 +317,7 @@ class CodeBuilder(private val topElement: PsiElement?, private var docConverter:
     }
 
     private companion object {
-        fun<T> List<T>.plus(other: List<T>): List<T> {
+        operator fun<T> List<T>.plus(other: List<T>): List<T> {
             when {
                 isEmpty() -> return other
 
@@ -332,11 +332,11 @@ class CodeBuilder(private val topElement: PsiElement?, private var docConverter:
             }
         }
 
-        fun<T> List<T>.reverse(): List<T> {
+        fun<T> List<T>.reversed(): List<T> {
             return if (size() <= 1)
                 this
             else
-                (this as Iterable<T>).reverse()
+                this.asReversed()
         }
 
         fun PsiElement.isCommentOrSpace() = this is PsiComment || this is PsiWhiteSpace
diff --git a/j2k/src/org/jetbrains/kotlin/j2k/StatementConverter.kt b/j2k/src/org/jetbrains/kotlin/j2k/StatementConverter.kt
index 98c4620f601..a1a6e047284 100644
--- a/j2k/src/org/jetbrains/kotlin/j2k/StatementConverter.kt
+++ b/j2k/src/org/jetbrains/kotlin/j2k/StatementConverter.kt
@@ -216,7 +216,7 @@ class DefaultStatementConverter : JavaElementVisitor(), StatementConverter {
 
         var block = converterForBody.convertBlock(tryBlock)
         var expression: Expression = Expression.Empty
-        for (variable in resourceVariables.reverse()) {
+        for (variable in resourceVariables.asReversed()) {
             val parameter = LambdaParameter(Identifier(variable.name!!).assignNoPrototype(), null).assignNoPrototype()
             val parameterList = ParameterList(listOf(parameter)).assignNoPrototype()
             val lambda = LambdaExpression(parameterList, block)