Gentle start with removing explicit interfaces

corelib/src/comparable.dart

Index: corelib/src/comparable.dart
===================================================================
--- corelib/src/comparable.dart	(revision 11241)
+++ corelib/src/comparable.dart	(working copy)
@@ -4,6 +4,10 @@
 
 // Dart core library.
 
-interface Comparable {
-  int compareTo(Comparable other);
+abstract class Comparable {
+  factory Comparable._uninstantiable() {
+    throw const UnsupportedOperationException(
+        "abstract class Comparable cannot be instantiated");
+  }

[bakster, 2012/08/24 06:32:50]

I don't understand why this is needed. If the class is abstract a new operation
will throw an error.
That should be sufficient.

[hausner, 2012/08/24 15:25:45]

I checked this with Gilad of course. He says that an abstract class can be
instantiated.

It seems there is some confusion about the semantics of abstract classes. It
might be worthwhile for you, Kasper and Gilad to confirm that you all have the
same idea.




On 2012/08/24 06:32:50, bak1 wrote:

+  abstract int compareTo(Comparable other);
 }