Fix a bug in lastIndexOf and lastIndexWhere

Author: Antoine Brunner

library/src-bootstrapped/scala/IArray.scala

@@ -122,11 +122,11 @@ object opaques
     def [T](arr: IArray[T]) lastOption: Option[T] =
       genericArrayOps(arr).lastOption
 
-    def [T](arr: IArray[T]) lastIndexOf(elem: T, from: Int = 0): Int =
-      genericArrayOps(arr.asInstanceOf[Array[T]]).lastIndexOf(elem, from)
+    def [T](arr: IArray[T]) lastIndexOf(elem: T, end: Int = arr.length - 1): Int =
+      genericArrayOps(arr.asInstanceOf[Array[T]]).lastIndexOf(elem, end)
 
-    def [T](arr: IArray[T]) lastIndexWhere(p: T => Boolean, from: Int = 0): Int =
-      genericArrayOps(arr).lastIndexWhere(p, from)
+    def [T](arr: IArray[T]) lastIndexWhere(p: T => Boolean, end: Int = arr.length - 1): Int =
+      genericArrayOps(arr).lastIndexWhere(p, end)
 
     def [T, U: ClassTag](arr: IArray[T]) map(f: T => U): IArray[U] =
       genericArrayOps(arr).map(f).asInstanceOf[IArray[U]]

tests/run-bootstrapped/iarray-extmtds.scala

@@ -70,9 +70,9 @@ object Test extends App {
 
   println(arr2.lastOption)
 
-  println(arr2.lastIndexOf(17)) // Might be a bug
+  println(arr2.lastIndexOf(17))
 
-  println(arr1.lastIndexWhere(_ < 5)) // Might be a bug
+  println(arr1.lastIndexWhere(_ < 5))
 
   assertDifferent(arr1.map(_ + 10), arr1)