8 files changed, 165 insertions, 12 deletions
diff --git a/test/files/neg/abstract-report.check b/test/files/neg/abstract-report.check
new file mode 100644
index 0000000000..bd550f39f4
--- /dev/null
+++ b/test/files/neg/abstract-report.check
@@ -0,0 +1,24 @@
+abstract-report.scala:1: error: class Unimplemented needs to be abstract, since:
+it has 12 unimplemented members.
+/** As seen from class Unimplemented, the missing signatures are as follows.
+ *  For convenience, these are usable as stub implementations.
+ */
+  // Members declared in scala.collection.GenTraversableOnce
+  def isTraversableAgain: Boolean = ???
+  def toIterator: Iterator[String] = ???
+  def toStream: Stream[String] = ???
+  
+  // Members declared in scala.collection.TraversableOnce
+  def copyToArray[B >: String](xs: Array[B],start: Int,len: Int): Unit = ???
+  def exists(p: String => Boolean): Boolean = ???
+  def find(p: String => Boolean): Option[String] = ???
+  def forall(p: String => Boolean): Boolean = ???
+  def foreach[U](f: String => U): Unit = ???
+  def hasDefiniteSize: Boolean = ???
+  def isEmpty: Boolean = ???
+  def seq: scala.collection.TraversableOnce[String] = ???
+  def toTraversable: Traversable[String] = ???
+
+class Unimplemented extends TraversableOnce[String] { }
+      ^
+one error found
diff --git a/test/files/neg/abstract-report.scala b/test/files/neg/abstract-report.scala
new file mode 100644
index 0000000000..538e093547
--- /dev/null
+++ b/test/files/neg/abstract-report.scala
@@ -0,0 +1 @@
+class Unimplemented extends TraversableOnce[String] { }
+\ No newline at end of file
diff --git a/test/files/neg/abstract-report2.check b/test/files/neg/abstract-report2.check
new file mode 100644
index 0000000000..32d52e00f2
--- /dev/null
+++ b/test/files/neg/abstract-report2.check
@@ -0,0 +1,99 @@
+abstract-report2.scala:3: error: class Foo needs to be abstract, since:
+it has 12 unimplemented members.
+/** As seen from class Foo, the missing signatures are as follows.
+ *  For convenience, these are usable as stub implementations.
+ */
+  def add(x$1: Int): Boolean = ???
+  def addAll(x$1: java.util.Collection[_ <: Int]): Boolean = ???
+  def clear(): Unit = ???
+  def contains(x$1: Any): Boolean = ???
+  def containsAll(x$1: java.util.Collection[_]): Boolean = ???
+  def isEmpty(): Boolean = ???
+  def iterator(): java.util.Iterator[Int] = ???
+  def remove(x$1: Any): Boolean = ???
+  def removeAll(x$1: java.util.Collection[_]): Boolean = ???
+  def retainAll(x$1: java.util.Collection[_]): Boolean = ???
+  def size(): Int = ???
+  def toArray[T](x$1: Array[T with Object]): Array[T with Object] = ???
+
+class Foo extends Collection[Int]
+      ^
+abstract-report2.scala:5: error: class Bar needs to be abstract, since:
+it has 12 unimplemented members.
+/** As seen from class Bar, the missing signatures are as follows.
+ *  For convenience, these are usable as stub implementations.
+ */
+  def add(x$1: List[_ <: String]): Boolean = ???
+  def addAll(x$1: java.util.Collection[_ <: List[_ <: String]]): Boolean = ???
+  def clear(): Unit = ???
+  def contains(x$1: Any): Boolean = ???
+  def containsAll(x$1: java.util.Collection[_]): Boolean = ???
+  def isEmpty(): Boolean = ???
+  def iterator(): java.util.Iterator[List[_ <: String]] = ???
+  def remove(x$1: Any): Boolean = ???
+  def removeAll(x$1: java.util.Collection[_]): Boolean = ???
+  def retainAll(x$1: java.util.Collection[_]): Boolean = ???
+  def size(): Int = ???
+  def toArray[T](x$1: Array[T with Object]): Array[T with Object] = ???
+
+class Bar extends Collection[List[_ <: String]]
+      ^
+abstract-report2.scala:7: error: class Baz needs to be abstract, since:
+it has 12 unimplemented members.
+/** As seen from class Baz, the missing signatures are as follows.
+ *  For convenience, these are usable as stub implementations.
+ */
+  def add(x$1: T): Boolean = ???
+  def addAll(x$1: java.util.Collection[_ <: T]): Boolean = ???
+  def clear(): Unit = ???
+  def contains(x$1: Any): Boolean = ???
+  def containsAll(x$1: java.util.Collection[_]): Boolean = ???
+  def isEmpty(): Boolean = ???
+  def iterator(): java.util.Iterator[T] = ???
+  def remove(x$1: Any): Boolean = ???
+  def removeAll(x$1: java.util.Collection[_]): Boolean = ???
+  def retainAll(x$1: java.util.Collection[_]): Boolean = ???
+  def size(): Int = ???
+  def toArray[T](x$1: Array[T with Object]): Array[T with Object] = ???
+
+class Baz[T] extends Collection[T]
+      ^
+abstract-report2.scala:11: error: class Dingus needs to be abstract, since:
+it has 23 unimplemented members.
+/** As seen from class Dingus, the missing signatures are as follows.
+ *  For convenience, these are usable as stub implementations.
+ */
+  // Members declared in java.util.Collection
+  def add(x$1: String): Boolean = ???
+  def addAll(x$1: java.util.Collection[_ <: String]): Boolean = ???
+  def clear(): Unit = ???
+  def contains(x$1: Any): Boolean = ???
+  def containsAll(x$1: java.util.Collection[_]): Boolean = ???
+  def iterator(): java.util.Iterator[String] = ???
+  def remove(x$1: Any): Boolean = ???
+  def removeAll(x$1: java.util.Collection[_]): Boolean = ???
+  def retainAll(x$1: java.util.Collection[_]): Boolean = ???
+  def toArray[T](x$1: Array[T with Object]): Array[T with Object] = ???
+  
+  // Members declared in scala.collection.GenTraversableOnce
+  def isTraversableAgain: Boolean = ???
+  def toIterator: Iterator[(Set[Int], String)] = ???
+  def toStream: Stream[(Set[Int], String)] = ???
+  
+  // Members declared in scala.math.Ordering
+  def compare(x: List[Int],y: List[Int]): Int = ???
+  
+  // Members declared in scala.collection.TraversableOnce
+  def copyToArray[B >: (Set[Int], String)](xs: Array[B],start: Int,len: Int): Unit = ???
+  def exists(p: ((Set[Int], String)) => Boolean): Boolean = ???
+  def find(p: ((Set[Int], String)) => Boolean): Option[(Set[Int], String)] = ???
+  def forall(p: ((Set[Int], String)) => Boolean): Boolean = ???
+  def foreach[U](f: ((Set[Int], String)) => U): Unit = ???
+  def hasDefiniteSize: Boolean = ???
+  def isEmpty: Boolean = ???
+  def seq: scala.collection.TraversableOnce[(Set[Int], String)] = ???
+  def toTraversable: Traversable[(Set[Int], String)] = ???
+
+class Dingus extends Bippy[String, Set[Int], List[Int]]
+      ^
+four errors found
diff --git a/test/files/neg/abstract-report2.scala b/test/files/neg/abstract-report2.scala
new file mode 100644
index 0000000000..b6327b0766
--- /dev/null
+++ b/test/files/neg/abstract-report2.scala
@@ -0,0 +1,11 @@
+import java.util.Collection
+
+class Foo extends Collection[Int]
+
+class Bar extends Collection[List[_ <: String]]
+
+class Baz[T] extends Collection[T]
+
+trait Bippy[T1, T2, T3] extends Collection[T1] with TraversableOnce[(T2, String)] with Ordering[T3]
+
+class Dingus extends Bippy[String, Set[Int], List[Int]]
+\ No newline at end of file
diff --git a/test/files/neg/t2208.check b/test/files/neg/t2208.check
index a97b20cba7..64bb3a77c8 100644
--- a/test/files/neg/t2208.check
+++ b/test/files/neg/t2208.check
@@ -1,4 +1,4 @@
 t2208.scala:7: error: type arguments [Any] do not conform to type Alias's type parameter bounds [X <: Test.A]
 	class C extends Alias[Any]   // not ok, normalisation should check bounds before expanding Alias
                         ^
-one error found
-\ No newline at end of file
+one error found
diff --git a/test/files/neg/t2213.check b/test/files/neg/t2213.check
index f59503ee2a..9fb3bb2eb7 100644
--- a/test/files/neg/t2213.check
+++ b/test/files/neg/t2213.check
@@ -1,15 +1,25 @@
 t2213.scala:9: error: class C needs to be abstract, since:
-value y in class A of type Int is not defined
-value x in class A of type Int is not defined
-method g in class A of type => Int is not defined
-method f in class A of type => Int is not defined
+it has 4 unimplemented members.
+/** As seen from class C, the missing signatures are as follows.
+ *  For convenience, these are usable as stub implementations.
+ */
+  def f: Int = ???
+  def g: Int = ???
+  val x: Int = ???
+  val y: Int = ???
+
 class C extends A {}
       ^
 t2213.scala:11: error: object creation impossible, since:
-value y in class A of type Int is not defined
-value x in class A of type Int is not defined
-method g in class A of type => Int is not defined
-method f in class A of type => Int is not defined
+it has 4 unimplemented members.
+/** As seen from object Q, the missing signatures are as follows.
+ *  For convenience, these are usable as stub implementations.
+ */
+  def f: Int = ???
+  def g: Int = ???
+  val x: Int = ???
+  val y: Int = ???
+
 object Q extends A { }
        ^
 two errors found
diff --git a/test/files/neg/t856.check b/test/files/neg/t856.check
index d0bbde6c58..02978e1622 100644
--- a/test/files/neg/t856.check
+++ b/test/files/neg/t856.check
@@ -1,6 +1,14 @@
 t856.scala:3: error: class ComplexRect needs to be abstract, since:
-method _2 in trait Product2 of type => Double is not defined
-method canEqual in trait Equals of type (that: Any)Boolean is not defined
+it has 2 unimplemented members.
+/** As seen from class ComplexRect, the missing signatures are as follows.
+ *  For convenience, these are usable as stub implementations.
+ */
+  // Members declared in scala.Equals
+  def canEqual(that: Any): Boolean = ???
+  
+  // Members declared in scala.Product2
+  def _2: Double = ???
+
 class ComplexRect(val _1:Double, _2:Double) extends Complex {
       ^
 one error found
diff --git a/test/files/neg/tcpoly_ticket2101.check b/test/files/neg/tcpoly_ticket2101.check
index eac582e8ba..ad0fd8bda2 100644
--- a/test/files/neg/tcpoly_ticket2101.check
+++ b/test/files/neg/tcpoly_ticket2101.check
@@ -1,4 +1,4 @@
 tcpoly_ticket2101.scala:2: error: type arguments [T2,X] do not conform to class T's type parameter bounds [A[Y] <: T[A,B],B]
 class T2[X] extends T[T2, X] // ill-typed
                     ^
-one error found
-\ No newline at end of file
+one error found