Initial data commit

Task/Abstract-type/D/abstract-type.d

@@ -0,0 +1,27 @@
+import std.stdio;
+
+class Foo {
+    // abstract methods can have an implementation for
+    // use in super calls.
+    abstract void foo() {
+        writeln("Test");
+    }
+}
+
+interface Bar {
+    void bar();
+
+    // Final interface methods are allowed.
+    final int spam() { return 1; }
+}
+
+class Baz : Foo, Bar { // Super class must come first.
+    override void foo() {
+        writefln("Meep");
+        super.foo();
+    }
+
+    void bar() {}
+}
+
+void main() {}