Initial data commit

Task/Abstract-type/Skew/abstract-type.skew

@@ -0,0 +1,31 @@
+@entry
+def main {
+  var rgb = Rgb.new(0, 255, 255)
+  var hex = Hex.new("00ffff")
+
+  var color Color
+  color = hex
+  color.print
+
+  color = rgb
+  color.print
+
+  (hex as Color).print
+}
+
+interface Color {
+  def toString string
+  def print {
+    dynamic.console.log(self.toString)
+  }
+}
+
+class Rgb :: Color {
+  var r int, g int, b int
+  def toString string { return "rgb(\(r), \(g), \(b))" }
+}
+
+class Hex :: Color {
+  var code string
+  def toString string { return "#\(code)" }
+}