1 files changed, 35 insertions, 0 deletions
diff --git a/rust/space-age/src/lib.rs b/rust/space-age/src/lib.rs
new file mode 100644
index 0000000..fec643f
--- /dev/null
+++ b/rust/space-age/src/lib.rs
@@ -0,0 +1,35 @@
+#[derive(Debug)]
+pub struct Duration;
+
+impl From<u64> for Duration {
+    fn from(s: u64) -> Self {
+        unimplemented!("s, measured in seconds: {}", s)
+    }
+}
+
+pub trait Planet {
+    fn years_during(d: &Duration) -> f64 {
+        unimplemented!(
+            "convert a duration ({:?}) to the number of years on this planet for that duration",
+            d,
+        );
+    }
+}
+
+pub struct Mercury;
+pub struct Venus;
+pub struct Earth;
+pub struct Mars;
+pub struct Jupiter;
+pub struct Saturn;
+pub struct Uranus;
+pub struct Neptune;
+
+impl Planet for Mercury {}
+impl Planet for Venus {}
+impl Planet for Earth {}
+impl Planet for Mars {}
+impl Planet for Jupiter {}
+impl Planet for Saturn {}
+impl Planet for Uranus {}
+impl Planet for Neptune {}