Make stream plus operation actually streaming (lazy).

libraries/stdlib/src/generated/_Generators.kt

@@ -420,9 +420,7 @@ public fun <T> Iterable<T>.plus(collection: Iterable<T>) : List<T> {
  * Returns a stream containing all elements of original stream and then all elements of the given *collection*
  */
 public fun <T> Stream<T>.plus(collection: Iterable<T>) : Stream<T> {
-    val answer = toArrayList()
-    answer.addAll(collection)
-    return answer.stream()
+    return Multistream(streamOf(this, collection.stream()))
     
 }
 
@@ -530,9 +528,7 @@ public fun <T> Iterable<T>.plus(element: T) : List<T> {
  * Returns a stream containing all elements of original stream and then the given element
  */
 public fun <T> Stream<T>.plus(element: T) : Stream<T> {
-    val answer = toArrayList()
-    answer.add(element)
-    return answer.stream()
+    return Multistream(streamOf(this, streamOf(element)))
     
 }
 
@@ -540,9 +536,7 @@ public fun <T> Stream<T>.plus(element: T) : Stream<T> {
  * Returns a stream containing all elements of original stream and then all elements of the given *stream*
  */
 public fun <T> Stream<T>.plus(stream: Stream<T>) : Stream<T> {
-    val answer = toArrayList()
-    answer.addAll(stream)
-    return answer.stream()
+    return Multistream(streamOf(this, stream))
     
 }
 

libraries/stdlib/src/generated/_Streams.kt

@@ -0,0 +1,96 @@
+package kotlin
+
+//
+// NOTE THIS FILE IS AUTO-GENERATED by the GenerateStandardLib.kt
+// See: https://github.com/JetBrains/kotlin/tree/master/libraries/stdlib
+//
+
+import java.util.*
+
+/**
+ * Returns a stream from the given collection
+ */
+public fun <T> Array<out T>.stream() : Stream<T> {
+    return object : Stream<T> { override fun iterator() : Iterator<T> { return this@stream.iterator() } }
+    
+}
+
+/**
+ * Returns a stream from the given collection
+ */
+public fun BooleanArray.stream() : Stream<Boolean> {
+    return object : Stream<Boolean> { override fun iterator() : Iterator<Boolean> { return this@stream.iterator() } }
+    
+}
+
+/**
+ * Returns a stream from the given collection
+ */
+public fun ByteArray.stream() : Stream<Byte> {
+    return object : Stream<Byte> { override fun iterator() : Iterator<Byte> { return this@stream.iterator() } }
+    
+}
+
+/**
+ * Returns a stream from the given collection
+ */
+public fun CharArray.stream() : Stream<Char> {
+    return object : Stream<Char> { override fun iterator() : Iterator<Char> { return this@stream.iterator() } }
+    
+}
+
+/**
+ * Returns a stream from the given collection
+ */
+public fun DoubleArray.stream() : Stream<Double> {
+    return object : Stream<Double> { override fun iterator() : Iterator<Double> { return this@stream.iterator() } }
+    
+}
+
+/**
+ * Returns a stream from the given collection
+ */
+public fun FloatArray.stream() : Stream<Float> {
+    return object : Stream<Float> { override fun iterator() : Iterator<Float> { return this@stream.iterator() } }
+    
+}
+
+/**
+ * Returns a stream from the given collection
+ */
+public fun IntArray.stream() : Stream<Int> {
+    return object : Stream<Int> { override fun iterator() : Iterator<Int> { return this@stream.iterator() } }
+    
+}
+
+/**
+ * Returns a stream from the given collection
+ */
+public fun LongArray.stream() : Stream<Long> {
+    return object : Stream<Long> { override fun iterator() : Iterator<Long> { return this@stream.iterator() } }
+    
+}
+
+/**
+ * Returns a stream from the given collection
+ */
+public fun ShortArray.stream() : Stream<Short> {
+    return object : Stream<Short> { override fun iterator() : Iterator<Short> { return this@stream.iterator() } }
+    
+}
+
+/**
+ * Returns a stream from the given collection
+ */
+public fun <T> Iterable<T>.stream() : Stream<T> {
+    return object : Stream<T> { override fun iterator() : Iterator<T> { return this@stream.iterator() } }
+}
+
+/**
+ * Returns a stream from the given collection
+ */
+public fun <T> Stream<T>.stream() : Stream<T> {
+    return this
+    
+}
+