Add {mutable,immutable}.Iterable.scala to stdlib tests

Author: odersky

tests/pos/stdlib/collection/immutable/Iterable.scala

@@ -0,0 +1,39 @@
+/*
+ * Scala (https://www.scala-lang.org)
+ *
+ * Copyright EPFL and Lightbend, Inc.
+ *
+ * Licensed under Apache License 2.0
+ * (http://www.apache.org/licenses/LICENSE-2.0).
+ *
+ * See the NOTICE file distributed with this work for
+ * additional information regarding copyright ownership.
+ */
+
+package scala.collection.immutable
+
+import scala.collection.{IterableFactory, IterableFactoryDefaults}
+import language.experimental.captureChecking
+
+/** A trait for collections that are guaranteed immutable.
+  *
+  * @tparam A the element type of the collection
+  *
+  * @define coll immutable collection
+  * @define Coll `immutable.Iterable`
+  */
+trait Iterable[+A] extends collection.Iterable[A]
+                      with collection.IterableOps[A, Iterable, Iterable[A]]
+                      with IterableFactoryDefaults[A, Iterable] {
+  this: Iterable[A]^ =>
+
+  override def iterableFactory: IterableFactory[Iterable] = Iterable
+}
+
+@SerialVersionUID(3L)
+object Iterable extends IterableFactory.Delegate[Iterable](List) {
+  override def from[E](it: IterableOnce[E]): Iterable[E] = it match {
+    case iterable: Iterable[E] => iterable
+    case _ => super.from(it)
+  }
+}

tests/pos/stdlib/collection/mutable/Iterable.scala

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+/*
+ * Scala (https://www.scala-lang.org)
+ *
+ * Copyright EPFL and Lightbend, Inc.
+ *
+ * Licensed under Apache License 2.0
+ * (http://www.apache.org/licenses/LICENSE-2.0).
+ *
+ * See the NOTICE file distributed with this work for
+ * additional information regarding copyright ownership.
+ */
+
+package scala.collection.mutable
+
+import scala.collection.{IterableFactory, IterableFactoryDefaults}
+import language.experimental.captureChecking
+
+trait Iterable[A]
+  extends collection.Iterable[A]
+    with collection.IterableOps[A, Iterable, Iterable[A]]
+    with IterableFactoryDefaults[A, Iterable] {
+  this: Iterable[A]^ =>
+
+  override def iterableFactory: IterableFactory[Iterable] = Iterable
+}
+
+/**
+  * $factoryInfo
+  * @define coll mutable collection
+  * @define Coll `mutable.Iterable`
+  */
+@SerialVersionUID(3L)
+object Iterable extends IterableFactory.Delegate[Iterable](ArrayBuffer)
+
+/** Explicit instantiation of the `Iterable` trait to reduce class file size in subclasses. */
+abstract class AbstractIterable[A] extends scala.collection.AbstractIterable[A] with Iterable[A]:
+  this: AbstractIterable[A]^ =>

tests/pos/stdlib/immutable_Iterable.scala

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+collection/immutable/Iterable.scala

tests/pos/stdlib/mutable_Iterable.scala

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+collection/mutable/Iterable.scala