2 files changed, 21 insertions, 0 deletions
diff --git a/test/files/neg/t6666b.check b/test/files/neg/t6666b.check
new file mode 100644
index 0000000000..090bee800d
--- /dev/null
+++ b/test/files/neg/t6666b.check
@@ -0,0 +1,4 @@
+t6666b.scala:6: error: Implementation restriction: access of object TreeOrd$1 from object TreeOrd$2, would require illegal premature access to the unconstructed `this` of class Test
+    implicit object TreeOrd extends Ordering[K](){
+                    ^
+one error found
diff --git a/test/files/neg/t6666b.scala b/test/files/neg/t6666b.scala
new file mode 100644
index 0000000000..0b8f1aa1a3
--- /dev/null
+++ b/test/files/neg/t6666b.scala
@@ -0,0 +1,17 @@
+import scala.collection.immutable.TreeMap
+import scala.math.Ordering
+
+class Test[K](param:TreeMap[K,Int]){
+  def this() = this({
+    implicit object TreeOrd extends Ordering[K](){
+      def compare(a: K, b: K) = {
+        -1
+      }
+    }
+    new TreeMap[K, Int]()
+  })
+}
+
+object Test extends App {
+  new Test()
+}