Gentle start with removing explicit interfaces

corelib/src/function.dart

Index: corelib/src/function.dart
===================================================================
--- corelib/src/function.dart	(revision 11192)
+++ corelib/src/function.dart	(working copy)
@@ -4,5 +4,9 @@
 
 // Dart core library.
 
-interface Function {
+abstract class Function {
+  factory Function._uninstantiable() {
+    throw const UnsupportedOperationException(

[hausner, 2012/08/23 18:34:10]

returning null as I do in other cases would suffice too. I guess it's a matter
of style.

+        "abstract class Function cannot be allocated");
+  }
 }