initial commit

exercises/04_traits/02_orphan_rule/Cargo.toml

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+[package]
+name = "orphan"
+version = "0.1.0"
+edition = "2021"

exercises/04_traits/02_orphan_rule/src/lib.rs

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+// TODO: this is an example of an orphan rule violation.
+//  We're implementing a foreign trait (`PartialEq`, from `std`) on
+//  a foreign type (`u32`, from `std`).
+//  Look at the compiler error to get familiar with what it looks like.
+//  Then delete the code below and move on to the next exercise.
+
+impl PartialEq for u32 {
+    fn eq(&self, _other: &Self) -> bool {
+        todo!()
+    }
+}