Add more tests for repeated args

Author: allanrenucci

tests/pos/repeatedArgs.scala

@@ -1,3 +1,22 @@
-object testRepeated {
- def foo = java.lang.System.out.format("%4$2s %3$2s %2$2s %1$2s", "a", "b", "c", "d")
+import scala.collection.{immutable, mutable}
+import java.nio.file.Paths
+
+class repeatedArgs {
+  def bar(xs: String*): Int = xs.length
+
+  def test(xs: immutable.Seq[String], ys: collection.Seq[String], zs: Array[String]): Unit = {
+    bar("a", "b", "c")
+    bar(xs: _*)
+    bar(ys: _*) // error in 2.13
+    bar(zs: _*)
+
+    Paths.get("Hello", "World")
+    Paths.get("Hello", xs: _*)
+    Paths.get("Hello", ys: _*) // error in 2.13
+    Paths.get("Hello", zs: _*)
+
+    val List(_, others: _*) = xs.toList // toList should not be needed, see #4790
+    val x: collection.Seq[String] = others
+    // val y: immutable.Seq[String] = others // ok in 2.13
+  }
 }