Index: app/src/org/scalatest/prop/Checkers.scala
===================================== ==============================
--- app/src/org/scalatest/prop/Checkers.scala   (revision 815)
+++ app/src/org/scalatest/prop/Checkers.scala   (working copy)
@@ -227,9 +227,11 @@
       result.discarded + " tests were discarded."
     case Test.PropException(args, e, labels) =>
       "Exception \"" + e + "\" raised on property evaluation:\n" +
-      prettyArgs(args)
+      prettyArgs(args) + ";\n" +
+      prettyThrowable(e)
     case Test.GenException(e) =>
-      "Exception \"" + e + "\" raised on argument generation."
+      "Exception \"" + e + "\" raised on argument generation: \n" +
+      prettyThrowable(e)
   }
 
   private def prettyArgs(args: List[Arg]) = {
@@ -241,4 +243,13 @@
     )
     strs.mkString("\n")
   }
+
+  private def prettyThrowable(t: Throwable) = {
+    import java.io._
+    val baos = new ByteArrayOutputStream
+    val pos = new PrintStream(baos)
+    t.printStackTrace(pos)
+    pos.flush
+    baos.toString("UTF8")
+  }
 }