diff --git a/pttodoer/src/main.rs b/pttodoer/src/main.rs
index e7a11a9..9710412 100644
--- a/pttodoer/src/main.rs
+++ b/pttodoer/src/main.rs
@@ -1,3 +1,27 @@
 fn main() {
-    println!("Hello, world!");
+    println!("{:?}", Task{todo: "x".to_string(), when: None, detail: None, sub: vec![]})
+}
+
+#[derive(Debug)]
+struct Task {
+   pub todo: String,
+   pub when: Option<When>,
+   pub detail: Option<String>,
+   pub sub: Vec<Task>,
+}
+
+impl Task {
+   fn is_due(&self) -> bool {
+      self.when.is_none() || self.when.clone().unwrap().is_due()
+   }
+}
+
+#[derive(Debug, Clone)]
+struct When(String);
+
+impl When {
+   fn is_due(&self) -> bool {
+      assert!(false);
+      false
+   }
 }