Add test that exercises a cycle reference when playing with SeqType

Author: allanrenucci

tests/pos/seqtype-cycle/Test1.scala

@@ -0,0 +1,3 @@
+class Test {
+  def bar = Array(1) // call to Array(_: Repeated)
+}

tests/pos/seqtype-cycle/Test2.scala

@@ -0,0 +1,8 @@
+package object scala {
+  // needed for some reasons
+  type Throwable = java.lang.Throwable
+  type IndexOutOfBoundsException = java.lang.IndexOutOfBoundsException
+
+  type Seq[+A] = scala.collection.Seq[A]
+  val Seq = scala.collection.Seq
+}

tests/pos/seqtype-cycle/Test3.scala

@@ -0,0 +1,12 @@
+package scala
+
+class specialized(types: Int*) extends scala.annotation.StaticAnnotation
+
+package collection {
+  class Foo[@specialized(1, 2) A]
+
+  trait Seq[A] extends Foo[A]
+  object Seq extends SeqFactory[Seq]
+
+  trait SeqFactory[CC[X] <: Seq[X]]
+}