From 535bf4ce676bdd6a2a53f760a04c2bf33b1f0983 Mon Sep 17 00:00:00 2001
From: julio4 <30329843+julio4@users.noreply.github.com>
Date: Wed, 25 Dec 2024 17:26:16 +0100
Subject: [PATCH 1/2] feat: range fmt::debug

---
 corelib/src/ops/range.cairo       | 16 ++++++++++++++++
 corelib/src/test.cairo            |  1 +
 corelib/src/test/range_test.cairo |  4 ++++
 3 files changed, 21 insertions(+)
 create mode 100644 corelib/src/test/range_test.cairo

diff --git a/corelib/src/ops/range.cairo b/corelib/src/ops/range.cairo
index 80a8bbe13df..55859544317 100644
--- a/corelib/src/ops/range.cairo
+++ b/corelib/src/ops/range.cairo
@@ -11,6 +11,22 @@ pub struct Range<T> {
     pub end: T,
 }
 
+impl RangeDebug<T, impl TDebug: crate::fmt::Debug<T>> of crate::fmt::Debug<Range<T>> {
+    /// Formats a `Range` type, allowing to print `Range` instances for debugging purposes.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// println!("{:?}", 1..5); // Result will be `1..5`
+    /// ```
+    fn fmt(self: @Range<T>, ref f: crate::fmt::Formatter) -> Result<(), crate::fmt::Error> {
+        self.start.fmt(ref f)?;
+        write!(f, "..")?;
+        self.end.fmt(ref f)?;
+        Result::Ok(())
+    }
+}
+
 /// Handles the range operator (`..`).
 #[generate_trait]
 pub impl RangeOpImpl<T> of RangeOp<T> {
diff --git a/corelib/src/test.cairo b/corelib/src/test.cairo
index b7fa57ea55d..1bd70bfb71f 100644
--- a/corelib/src/test.cairo
+++ b/corelib/src/test.cairo
@@ -20,6 +20,7 @@ mod num_test;
 mod option_test;
 mod plugins_test;
 mod print_test;
+mod range_test;
 mod result_test;
 mod secp256k1_test;
 mod secp256r1_test;
diff --git a/corelib/src/test/range_test.cairo b/corelib/src/test/range_test.cairo
new file mode 100644
index 00000000000..81f6bccdd71
--- /dev/null
+++ b/corelib/src/test/range_test.cairo
@@ -0,0 +1,4 @@
+#[test]
+fn test_range_format() {
+    assert(format!("{:?}", 1..5) == "1..5", 'bad range debug formatting');
+}

From 77044e3f667bfb6e13022558fdc0217cefbc9324 Mon Sep 17 00:00:00 2001
From: julio4 <30329843+julio4@users.noreply.github.com>
Date: Wed, 25 Dec 2024 19:27:36 +0100
Subject: [PATCH 2/2] fix: use assert! macro in range_test

---
 corelib/src/test/range_test.cairo | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/corelib/src/test/range_test.cairo b/corelib/src/test/range_test.cairo
index 81f6bccdd71..b2fc6f217cf 100644
--- a/corelib/src/test/range_test.cairo
+++ b/corelib/src/test/range_test.cairo
@@ -1,4 +1,4 @@
 #[test]
 fn test_range_format() {
-    assert(format!("{:?}", 1..5) == "1..5", 'bad range debug formatting');
+    assert!(format!("{:?}", 1..5) == "1..5");
 }