Check that non-abstract classes implement all methods.

dart/sdk/lib/_internal/compiler/implementation/warnings.dart

Index: dart/sdk/lib/_internal/compiler/implementation/warnings.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/warnings.dart b/dart/sdk/lib/_internal/compiler/implementation/warnings.dart
index dc92997d8578b51858a56a47171f6261cc4903c2..6b56455b5aeb1910da1a926a5af94f74be56bbb5 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/warnings.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/warnings.dart
@@ -1360,6 +1360,27 @@ main() {}
       howToFix: "Consider deleting it.",
       examples: const ["deadCode() {} main() {}"]);
 
+  static const MessageKind UNIMPLEMENTED_METHOD = const MessageKind(
+      "Warning: '#{class_name}' doesn't implement '#{member_name}'.",
+      howToFix: "Try adding an implementation of '#{member_name}'.",
+      examples: const ["""
+abstract class I {
+  m();
+}
+
+class C implements I {}
+
+main() => new C().m();
+""", """
+abstract class I {
+  m();
+}
+
+class C extends I {}
+
+main() => new C().m();

[Johnni Winther, 2013/12/04 12:09:14]

We should getter the warning without calling m.

[ahe, 2013/12/04 16:13:44]

No, but we do get a warning that it is never called which makes the test fail.

So I added another class D and made sure to invoke m on an instance of D.

+"""]);
+
   static const MessageKind COMPILER_CRASHED = const MessageKind(
       "Error: The compiler crashed when compiling this element.");