From b9b008c1d4a730335bdc9d465b0fdf7869fb09d4 Mon Sep 17 00:00:00 2001
From: Hunter Kvalevog <hunter@kvog.sh>
Date: Sun, 27 Sep 2026 12:11:32 -0500
Subject: rustlings: complete 13

---
 rustlings/solutions/13_error_handling/errors4.rs | 42 ++++++++++++++++++++++--
 1 file changed, 40 insertions(+), 2 deletions(-)

(limited to 'rustlings/solutions/13_error_handling/errors4.rs')

diff --git a/rustlings/solutions/13_error_handling/errors4.rs b/rustlings/solutions/13_error_handling/errors4.rs
index dcf2377..70c5f1c 100644
--- a/rustlings/solutions/13_error_handling/errors4.rs
+++ b/rustlings/solutions/13_error_handling/errors4.rs
@@ -1,4 +1,42 @@
+use std::cmp::Ordering;
+
+#[derive(PartialEq, Debug)]
+enum CreationError {
+    Negative,
+    Zero,
+}
+
+#[derive(PartialEq, Debug)]
+struct PositiveNonzeroInteger(u64);
+
+impl PositiveNonzeroInteger {
+    fn new(value: i64) -> Result<Self, CreationError> {
+        match value.cmp(&0) {
+            Ordering::Less => Err(CreationError::Negative),
+            Ordering::Equal => Err(CreationError::Zero),
+            Ordering::Greater => Ok(Self(value as u64)),
+        }
+    }
+}
+
 fn main() {
-    // DON'T EDIT THIS SOLUTION FILE!
-    // It will be automatically filled after you finish the exercise.
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_creation() {
+        assert_eq!(
+            PositiveNonzeroInteger::new(10),
+            Ok(PositiveNonzeroInteger(10)),
+        );
+        assert_eq!(
+            PositiveNonzeroInteger::new(-10),
+            Err(CreationError::Negative),
+        );
+        assert_eq!(PositiveNonzeroInteger::new(0), Err(CreationError::Zero));
+    }
 }
-- 
cgit v1.2.3