fix procedure syntax

Author: xuwei-k

core/src/main/scala/scala/collection/parallel/ParIterableLike.scala

@@ -166,7 +166,7 @@ self: ParIterableLike[T, Repr, Sequential] =>
   @volatile
   private var _tasksupport = defaultTaskSupport
 
-  protected def initTaskSupport() {
+  protected def initTaskSupport(): Unit = {
     _tasksupport = defaultTaskSupport
   }
 
@@ -331,7 +331,7 @@ self: ParIterableLike[T, Repr, Sequential] =>
 
   protected implicit def builder2ops[Elem, To](cb: Builder[Elem, To]) = new BuilderOps[Elem, To] {
     def ifIs[Cmb](isbody: Cmb => Unit) = new Otherwise[Cmb] {
-      def otherwise(notbody: => Unit)(implicit t: ClassTag[Cmb]) {
+      def otherwise(notbody: => Unit)(implicit t: ClassTag[Cmb]): Unit = {
         if (cb.getClass == t.runtimeClass) isbody(cb.asInstanceOf[Cmb]) else notbody
       }
     }
@@ -914,11 +914,11 @@ self: ParIterableLike[T, Repr, Sequential] =>
   extends NonDivisibleTask[R, Composite[FR, SR, R, First, Second]] {
     def combineResults(fr: FR, sr: SR): R
     @volatile var result: R = null.asInstanceOf[R]
-    private[parallel] override def signalAbort() {
+    private[parallel] override def signalAbort(): Unit = {
       ft.signalAbort()
       st.signalAbort()
     }
-    protected def mergeSubtasks() {
+    protected def mergeSubtasks(): Unit = {
       ft mergeThrowables st
       if (throwable eq null) result = combineResults(ft.result, st.result)
     }
@@ -956,7 +956,7 @@ self: ParIterableLike[T, Repr, Sequential] =>
       val initialResult = tasksupport.executeAndWaitResult(inner)
       result = map(initialResult)
     }
-    private[parallel] override def signalAbort() {
+    private[parallel] override def signalAbort(): Unit = {
       inner.signalAbort()
     }
     override def requiresStrictSplitters = inner.requiresStrictSplitters
@@ -1334,7 +1334,7 @@ self: ParIterableLike[T, Repr, Sequential] =>
   protected[this] class ToParCollection[U >: T, That](cbf: CombinerFactory[U, That], protected[this] val pit: IterableSplitter[T])
   extends Transformer[Combiner[U, That], ToParCollection[U, That]] {
     @volatile var result: Result = null
-    def leaf(prev: Option[Combiner[U, That]]) {
+    def leaf(prev: Option[Combiner[U, That]]): Unit = {
       result = cbf()
       while (pit.hasNext) result += pit.next
     }
@@ -1345,7 +1345,7 @@ self: ParIterableLike[T, Repr, Sequential] =>
   protected[this] class ToParMap[K, V, That](cbf: CombinerFactory[(K, V), That], protected[this] val pit: IterableSplitter[T])(implicit ev: T <:< (K, V))
   extends Transformer[Combiner[(K, V), That], ToParMap[K, V, That]] {
     @volatile var result: Result = null
-    def leaf(prev: Option[Combiner[(K, V), That]]) {
+    def leaf(prev: Option[Combiner[(K, V), That]]): Unit = {
       result = cbf()
       while (pit.hasNext) result += pit.next
     }
@@ -1394,7 +1394,7 @@ self: ParIterableLike[T, Repr, Sequential] =>
   (tree: ScanTree[U], z: U, op: (U, U) => U, cbf: CombinerFactory[U, That])
   extends StrictSplitterCheckTask[Combiner[U, That], FromScanTree[U, That]] {
     @volatile var result: Combiner[U, That] = null
-    def leaf(prev: Option[Combiner[U, That]]) {
+    def leaf(prev: Option[Combiner[U, That]]): Unit = {
       val cb = reuse(prev, cbf())
       iterate(tree, cb)
       result = cb
@@ -1443,11 +1443,11 @@ self: ParIterableLike[T, Repr, Sequential] =>
     val rightmost = right.rightmost
 
     def beginsAt = left.beginsAt
-    def pushdown(v: U) {
+    def pushdown(v: U): Unit = {
       left.pushdown(v)
       right.pushdown(v)
     }
-    def print(depth: Int) {
+    def print(depth: Int): Unit = {
       println((" " * depth) + "ScanNode, begins at " + beginsAt)
       left.print(depth + 1)
       right.print(depth + 1)

core/src/main/scala/scala/collection/parallel/RemainsIterator.scala

@@ -85,7 +85,7 @@ private[collection] trait AugmentedIterableIterator[+T] extends RemainsIterator[
     r
   }
 
-  override def copyToArray[U >: T](array: Array[U], from: Int, len: Int) {
+  override def copyToArray[U >: T](array: Array[U], from: Int, len: Int): Unit = {
     var i = from
     val until = from + len
     while (i < until && hasNext) {
@@ -229,7 +229,7 @@ private[collection] trait AugmentedIterableIterator[+T] extends RemainsIterator[
     (before, after)
   }
 
-  def scanToArray[U >: T, A >: U](z: U, op: (U, U) => U, array: Array[A], from: Int) {
+  def scanToArray[U >: T, A >: U](z: U, op: (U, U) => U, array: Array[A], from: Int): Unit = {
     var last = z
     var i = from
     while (hasNext) {

core/src/main/scala/scala/collection/parallel/Tasks.scala

@@ -35,14 +35,14 @@ trait Task[R, +Tp] {
   private[parallel] def split: Seq[Task[R, Tp]]
 
   /** Read of results of `that` task and merge them into results of this one. */
-  private[parallel] def merge(that: Tp @uncheckedVariance) {}
+  private[parallel] def merge(that: Tp @uncheckedVariance): Unit = {}
 
   // exception handling mechanism
   @volatile var throwable: Throwable = null
   def forwardThrowable() = if (throwable != null) throw throwable
 
   // tries to do the leaf computation, storing the possible exception
-  private[parallel] def tryLeaf(lastres: Option[R]) {
+  private[parallel] def tryLeaf(lastres: Option[R]): Unit = {
     try {
       tryBreakable {
         leaf(lastres)
@@ -58,21 +58,21 @@ trait Task[R, +Tp] {
     }
   }
 
-  private[parallel] def tryMerge(t: Tp @uncheckedVariance) {
+  private[parallel] def tryMerge(t: Tp @uncheckedVariance): Unit = {
     val that = t.asInstanceOf[Task[R, Tp]]
     if (this.throwable == null && that.throwable == null) merge(t)
     mergeThrowables(that)
   }
 
-  private[parallel] def mergeThrowables(that: Task[_, _]) {
+  private[parallel] def mergeThrowables(that: Task[_, _]): Unit = {
      if (this.throwable != null && that.throwable != null)
        this.throwable.addSuppressed(that.throwable)
      else if (this.throwable == null && that.throwable != null)
        this.throwable = that.throwable
   }
 
   // override in concrete task implementations to signal abort to other tasks
-  private[parallel] def signalAbort() {}
+  private[parallel] def signalAbort(): Unit = {}
 }
 
 
@@ -109,7 +109,7 @@ trait Tasks {
      *
      *  This method may be overridden.
      */
-    def release() {}
+    def release(): Unit = {}
   }
 
   /* task control */

core/src/main/scala/scala/collection/parallel/immutable/ParHashMap.scala

@@ -118,7 +118,7 @@ self =>
 
   /* debug */
 
-  private[parallel] def printDebugInfo() {
+  private[parallel] def printDebugInfo(): Unit = {
     println("Parallel hash trie")
     println("Top level inner trie type: " + trie.getClass)
     trie match {

core/src/main/scala/scala/collection/parallel/mutable/ParArray.scala

@@ -302,7 +302,7 @@ self =>
       this
     }
 
-    override def copyToArray[U >: T](array: Array[U], from: Int, len: Int) {
+    override def copyToArray[U >: T](array: Array[U], from: Int, len: Int): Unit = {
       val totallen = (self.length - i) min len min (array.length - from)
       Array.copy(arr, i, array, from, totallen)
       i += totallen
@@ -384,7 +384,7 @@ self =>
       cb
     }
 
-    private def map2combiner_quick[S, That](f: T => S, a: Array[Any], cb: Builder[S, That], ntil: Int, from: Int) {
+    private def map2combiner_quick[S, That](f: T => S, a: Array[Any], cb: Builder[S, That], ntil: Int, from: Int): Unit = {
       var j = from
       while (j < ntil) {
         cb += f(a(j).asInstanceOf[T])
@@ -399,7 +399,7 @@ self =>
       cb
     }
 
-    private def collect2combiner_quick[S, That](pf: PartialFunction[T, S], a: Array[Any], cb: Builder[S, That], ntil: Int, from: Int) {
+    private def collect2combiner_quick[S, That](pf: PartialFunction[T, S], a: Array[Any], cb: Builder[S, That], ntil: Int, from: Int): Unit = {
       var j = from
       val runWith = pf.runWith(b => cb += b)
       while (j < ntil) {
@@ -426,7 +426,7 @@ self =>
       cb
     }
 
-    private def filter2combiner_quick[U >: T, This](pred: T => Boolean, cb: Builder[U, This], a: Array[Any], ntil: Int, from: Int) {
+    private def filter2combiner_quick[U >: T, This](pred: T => Boolean, cb: Builder[U, This], a: Array[Any], ntil: Int, from: Int): Unit = {
       var j = i
       while(j < ntil) {
         val curr = a(j).asInstanceOf[T]
@@ -441,7 +441,7 @@ self =>
       cb
     }
 
-    private def filterNot2combiner_quick[U >: T, This](pred: T => Boolean, cb: Builder[U, This], a: Array[Any], ntil: Int, from: Int) {
+    private def filterNot2combiner_quick[U >: T, This](pred: T => Boolean, cb: Builder[U, This], a: Array[Any], ntil: Int, from: Int): Unit = {
       var j = i
       while(j < ntil) {
         val curr = a(j).asInstanceOf[T]
@@ -474,7 +474,7 @@ self =>
       cb
     }
 
-    private def copy2builder_quick[U >: T, Coll](b: Builder[U, Coll], a: Array[Any], ntil: Int, from: Int) {
+    private def copy2builder_quick[U >: T, Coll](b: Builder[U, Coll], a: Array[Any], ntil: Int, from: Int): Unit = {
       var j = from
       while (j < ntil) {
         b += a(j).asInstanceOf[T]
@@ -488,7 +488,7 @@ self =>
       (btrue, bfalse)
     }
 
-    private def partition2combiners_quick[U >: T, This](p: T => Boolean, btrue: Builder[U, This], bfalse: Builder[U, This], a: Array[Any], ntil: Int, from: Int) {
+    private def partition2combiners_quick[U >: T, This](p: T => Boolean, btrue: Builder[U, This], bfalse: Builder[U, This], a: Array[Any], ntil: Int, from: Int): Unit = {
       var j = from
       while (j < ntil) {
         val curr = a(j).asInstanceOf[T]
@@ -542,7 +542,7 @@ self =>
       cb
     }
 
-    private def reverse2combiner_quick(targ: Array[Any], a: Array[Any], targfrom: Int, srcfrom: Int, srcuntil: Int) {
+    private def reverse2combiner_quick(targ: Array[Any], a: Array[Any], targfrom: Int, srcfrom: Int, srcuntil: Int): Unit = {
       var j = srcfrom
       var k = targfrom + srcuntil - srcfrom - 1
       while (j < srcuntil) {
@@ -552,12 +552,12 @@ self =>
       }
     }
 
-    override def scanToArray[U >: T, A >: U](z: U, op: (U, U) => U, destarr: Array[A], from: Int) {
+    override def scanToArray[U >: T, A >: U](z: U, op: (U, U) => U, destarr: Array[A], from: Int): Unit = {
       scanToArray_quick[U](array, destarr.asInstanceOf[Array[Any]], op, z, i, until, from)
       i = until
     }
 
-    protected def scanToArray_quick[U](srcarr: Array[Any], destarr: Array[Any], op: (U, U) => U, z: U, srcfrom: Int, srcntil: Int, destfrom: Int) {
+    protected def scanToArray_quick[U](srcarr: Array[Any], destarr: Array[Any], op: (U, U) => U, z: U, srcfrom: Int, srcntil: Int, destfrom: Int): Unit = {
       var last = z
       var j = srcfrom
       var k = destfrom
@@ -619,7 +619,7 @@ self =>
       case ScanLeaf(_, _, from, len, None, _) =>
         scanLeaf(array, targetarr, from, len, z)
     }
-    private def scanLeaf(srcarr: Array[Any], targetarr: Array[Any], from: Int, len: Int, startval: U) {
+    private def scanLeaf(srcarr: Array[Any], targetarr: Array[Any], from: Int, len: Int, startval: U): Unit = {
       var i = from
       val until = from + len
       var curr = startval
@@ -665,11 +665,11 @@ self =>
 
   /* serialization */
 
-  private def writeObject(out: java.io.ObjectOutputStream) {
+  private def writeObject(out: java.io.ObjectOutputStream): Unit = {
     out.defaultWriteObject
   }
 
-  private def readObject(in: java.io.ObjectInputStream) {
+  private def readObject(in: java.io.ObjectInputStream): Unit = {
     in.defaultReadObject
 
     // get raw array from arrayseq

core/src/main/scala/scala/collection/parallel/mutable/ParFlatHashTable.scala

@@ -33,7 +33,7 @@ trait ParFlatHashTable[T] extends scala.collection.mutable.FlatHashTable[T] {
 
     if (hasNext) scan()
 
-    private[this] def scan() {
+    private[this] def scan(): Unit = {
       while (itertable(idx) eq null) {
         idx += 1
       }

core/src/main/scala/scala/collection/parallel/mutable/ParHashMap.scala

@@ -103,14 +103,14 @@ self =>
     new Entry(key, value.asInstanceOf[V])
   }
 
-  private def writeObject(out: java.io.ObjectOutputStream) {
+  private def writeObject(out: java.io.ObjectOutputStream): Unit = {
     serializeTo(out, { entry =>
       out.writeObject(entry.key)
       out.writeObject(entry.value)
     })
   }
 
-  private def readObject(in: java.io.ObjectInputStream) {
+  private def readObject(in: java.io.ObjectInputStream): Unit = {
     init(in, createNewEntry(in.readObject().asInstanceOf[K], in.readObject()))
   }
 
@@ -190,7 +190,7 @@ extends scala.collection.parallel.BucketCombiner[(K, V), ParHashMap[K, V], Defau
     // TODO parallelize by keeping separate sizemaps and merging them
     object table extends HashTable[K, DefaultEntry[K, V]] {
       type Entry = DefaultEntry[K, V]
-      def insertEntry(e: Entry) { super.findOrAddEntry(e.key, e) }
+      def insertEntry(e: Entry): Unit = { super.findOrAddEntry(e.key, e) }
       def createNewEntry[E](key: K, entry: E): Entry = entry.asInstanceOf[Entry]
       sizeMapInit(table.length)
     }
@@ -285,7 +285,7 @@ extends scala.collection.parallel.BucketCombiner[(K, V), ParHashMap[K, V], Defau
       val fp = howmany / 2
       List(new FillBlocks(buckets, table, offset, fp), new FillBlocks(buckets, table, offset + fp, howmany - fp))
     }
-    override def merge(that: FillBlocks) {
+    override def merge(that: FillBlocks): Unit = {
       this.result += that.result
     }
     def shouldSplitFurther = howmany > scala.collection.parallel.thresholdFromSize(ParHashMapCombiner.numblocks, combinerTaskSupport.parallelismLevel)

core/src/main/scala/scala/collection/parallel/mutable/ParHashSet.scala

@@ -81,11 +81,11 @@ extends ParSet[T]
     def newIterator(start: Int, until: Int, total: Int) = new ParHashSetIterator(start, until, total)
   }
 
-  private def writeObject(s: java.io.ObjectOutputStream) {
+  private def writeObject(s: java.io.ObjectOutputStream): Unit = {
     serializeTo(s)
   }
 
-  private def readObject(in: java.io.ObjectInputStream) {
+  private def readObject(in: java.io.ObjectInputStream): Unit = {
     init(in, x => ())
   }
 
@@ -238,7 +238,7 @@ with scala.collection.mutable.FlatHashTable.HashUtils[T] {
   extends Task[(Int, UnrolledBuffer[AnyRef]), FillBlocks] {
     var result = (Int.MinValue, new UnrolledBuffer[AnyRef])
 
-    def leaf(prev: Option[(Int, UnrolledBuffer[AnyRef])]) {
+    def leaf(prev: Option[(Int, UnrolledBuffer[AnyRef])]): Unit = {
       var i = offset
       var totalinserts = 0
       var leftover = new UnrolledBuffer[AnyRef]()
@@ -301,7 +301,7 @@ with scala.collection.mutable.FlatHashTable.HashUtils[T] {
       val fp = howmany / 2
       List(new FillBlocks(buckets, table, offset, fp), new FillBlocks(buckets, table, offset + fp, howmany - fp))
     }
-    override def merge(that: FillBlocks) {
+    override def merge(that: FillBlocks): Unit = {
       // take the leftovers from the left task, store them into the block of the right task
       val atPos = blockStart(that.offset)
       val beforePos = blockStart(that.offset + that.howmany)

core/src/main/scala/scala/collection/parallel/mutable/ParHashTable.scala

@@ -45,7 +45,7 @@ trait ParHashTable[K, Entry >: Null <: HashEntry[K, Entry]] extends scala.collec
       entry2item(res)
     }
 
-    def scan() {
+    def scan(): Unit = {
       while (es == null && idx < until) {
         es = itertable(idx).asInstanceOf[Entry]
         idx = idx + 1

core/src/main/scala/scala/collection/parallel/mutable/ResizableParArrayCombiner.scala

@@ -58,7 +58,7 @@ trait ResizableParArrayCombiner[T] extends LazyCombiner[T, ParArray[T], ExposedA
         ind = 0
       }
     }
-    private def copyChunk(buffarr: Array[AnyRef], buffStart: Int, ra: Array[Any], arrayStart: Int, until: Int) {
+    private def copyChunk(buffarr: Array[AnyRef], buffStart: Int, ra: Array[Any], arrayStart: Int, until: Int): Unit = {
       Array.copy(buffarr, buffStart, ra, arrayStart, until - buffStart)
     }
     private def findStart(pos: Int) = {

core/src/main/scala/scala/collection/parallel/mutable/UnrolledParArrayCombiner.scala

@@ -36,7 +36,7 @@ extends Combiner[T, ParArray[T]] {
     new ParArray(arrayseq)
   }
 
-  def clear() {
+  def clear(): Unit = {
     buff.clear()
   }
 

core/src/main/scala/scala/collection/parallel/package.scala

@@ -193,9 +193,9 @@ package parallel {
       sz = 0
     }
 
-    def beforeCombine[N <: Elem, NewTo >: To](other: Combiner[N, NewTo]) {}
+    def beforeCombine[N <: Elem, NewTo >: To](other: Combiner[N, NewTo]): Unit = {}
 
-    def afterCombine[N <: Elem, NewTo >: To](other: Combiner[N, NewTo]) {}
+    def afterCombine[N <: Elem, NewTo >: To](other: Combiner[N, NewTo]): Unit = {}
 
     def combine[N <: Elem, NewTo >: To](other: Combiner[N, NewTo]): Combiner[N, NewTo] = {
       if (this eq other) this