diff --git a/examples/contracts/insertionsort/InsertionSort.scala b/examples/contracts/insertionsort/InsertionSort.scala
new file mode 100644
index 0000000000000000000000000000000000000000..a262e326736fe69010c77fe77b23ae54c07f7293
--- /dev/null
+++ b/examples/contracts/insertionsort/InsertionSort.scala
@@ -0,0 +1,36 @@
+package contracts.insertionsort
+
+import scala.collection.immutable.Set
+
+object InsertionSort {
+  import funcheck.lib.Specs
+
+  assert(
+    Specs.forAll(
+      (l: List[Int]) => { content(sorted(l)) equals content(l) }
+    )
+  )
+
+  def content(l: List[Int]): Set[Int] = l match {
+    case Nil => Set.empty
+    case x :: xs => content(xs) + x
+  }
+
+  def sortedIns(e: Int, l: List[Int]): List[Int] = l match {
+    case Nil => e :: Nil
+    case x :: xs if (x < e) => x :: sortedIns(e, xs)
+    case _ => e :: l
+  }
+
+  def sorted(l: List[Int]): List[Int] = l match {
+    case Nil => Nil
+    case x :: xs => sortedIns(x, sorted(xs))
+  }
+
+  def main(args: Array[String]): Unit = {
+    val ls: List[Int] = List(5, 2, 4, 5, 1, 8)
+
+    println(ls)
+    println(sorted(ls))
+  }
+}
diff --git a/src/funcheck/lib/Specs.scala b/src/funcheck/lib/Specs.scala
index 9cb880a382bff49893661a5fb195f18786552552..ba31e18884b95620a922d192267bfb21d7d6ef6a 100644
--- a/src/funcheck/lib/Specs.scala
+++ b/src/funcheck/lib/Specs.scala
@@ -14,12 +14,17 @@ object Specs {
     def ==>(p: Boolean) = Specs ==> (b,p)
   }
   
-  def forAll[A](f: A => Boolean): Boolean =  
-    error("\"forAll\" combinator is currently unsupported by plugin.")
+  def forAll[A](f: A => Boolean): Boolean = {
+    Console.err.println("Warning: ignored forAll. Are you using the funcheck plugin?")
+    true
+    // error("\"forAll\" combinator is currently unsupported by plugin.")
+  }
 
 
   /** Implication */
-  def ==>(ifz: => Boolean, then: Boolean): Boolean =  
-    error("\"==>\" (implication) combinator is currently unsupported by plugin.")
-  
+  def ==>(ifz: => Boolean, then: Boolean): Boolean = {
+    Console.err.println("Warning: ignored implication. Are you using the funcheck plugin?")
+    true
+    //error("\"==>\" (implication) combinator is currently unsupported by plugin.")
+  }
 }