Merge pull request #42 from xuwei-k/TraversableOnceExtensionMethods

add "implicit class TraversableOnceExtensionMethods"

Author: julienrf

src/main/scala-2.11_2.12/scala/collection/compat/package.scala

@@ -54,6 +54,10 @@ package object compat {
     def rangeUntil(until: K): T = fact.until(until)
   }
 
+  implicit class TraversableOnceExtensionMethods[A](private val self: TraversableOnce[A]) extends AnyVal {
+    def iterator: Iterator[A] = self.toIterator
+  }
+
   // This really belongs into scala.collection but there's already a package object in scala-library so we can't add to it
   type IterableOnce[+X] = TraversableOnce[X]
   val  IterableOnce     = TraversableOnce

src/test/scala/test/scala/collection/CollectionTest.scala

@@ -46,4 +46,10 @@ class CollectionTest {
     val mT: Map[Int, String] = m
     assertEquals(Map(1 -> "a", 2 -> "b"), m)
   }
+
+  @Test
+  def testIterator: Unit = {
+    val xs = Iterator(1, 2, 3).iterator.toList
+    assertEquals(List(1, 2, 3), xs)
+  }
 }