From 80c4d01b7ff0c7017e4beb443f4004540f4a6efa Mon Sep 17 00:00:00 2001
From: Colin Davidson <colin@pentaquine.com>
Date: Sat, 16 Jan 2016 21:52:47 -0800
Subject: [PATCH 1/4] Add LowerHex and UpperHex formatting

---
 src/bigint.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/bigint.rs b/src/bigint.rs
index 386e749..07de81e 100644
--- a/src/bigint.rs
+++ b/src/bigint.rs
@@ -242,6 +242,18 @@ impl fmt::Display for BigUint {
     }
 }
 
+impl fmt::LowerHex for BigUint {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.to_str_radix(16))
+    }
+}
+
+impl fmt::UpperHex for BigUint {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.to_str_radix(16).to_uppercase())
+    }
+}
+
 impl FromStr for BigUint {
     type Err = ParseBigIntError;
 

From 04000436b162fc11cb5f8c55855e8a308054c204 Mon Sep 17 00:00:00 2001
From: Colin Davidson <colin@pentaquine.com>
Date: Sat, 16 Jan 2016 22:27:56 -0800
Subject: [PATCH 2/4] Switch to ascii uppercase function

---
 src/bigint.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/bigint.rs b/src/bigint.rs
index 07de81e..4acc2ac 100644
--- a/src/bigint.rs
+++ b/src/bigint.rs
@@ -76,6 +76,7 @@ use std::fmt;
 use std::cmp::Ordering::{self, Less, Greater, Equal};
 use std::{f32, f64};
 use std::{u8, i64, u64};
+use std::ascii::AsciiExt;
 
 // Some of the tests of non-RNG-based functionality are randomized using the
 // RNG-based functionality, so the RNG-based functionality needs to be enabled
@@ -250,7 +251,7 @@ impl fmt::LowerHex for BigUint {
 
 impl fmt::UpperHex for BigUint {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}", self.to_str_radix(16).to_uppercase())
+        write!(f, "{}", self.to_str_radix(16).to_ascii_uppercase())
     }
 }
 

From d5d7c855b0c8f4fa1db4e9dee6b22dc873ca25e8 Mon Sep 17 00:00:00 2001
From: Colin Davidson <colin@pentaquine.com>
Date: Sun, 17 Jan 2016 12:13:45 -0800
Subject: [PATCH 3/4] Add tests for UpperHex and LowerHex

---
 src/bigint.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/bigint.rs b/src/bigint.rs
index 4acc2ac..6255070 100644
--- a/src/bigint.rs
+++ b/src/bigint.rs
@@ -3723,6 +3723,24 @@ mod biguint_tests {
         }
     }
 
+    #[test]
+    fn test_upper_hex() {
+        let a = BigUint::parse_bytes(b"A", 16).unwrap();
+        let hello = BigUint::parse_bytes("22405534230753963835153736737".as_bytes(), 10).unwrap();
+
+        assert_eq!(format!("{:x}", a), "a");
+        assert_eq!(format!("{:x}", hello), "48656c6c6f20776f726c6421");
+    }
+
+    #[test]
+    fn test_lower_hex() {
+        let a = BigUint::parse_bytes(b"A", 16).unwrap();
+        let hello = BigUint::parse_bytes("22405534230753963835153736737".as_bytes(), 10).unwrap();
+
+        assert_eq!(format!("{:X}", a), "A");
+        assert_eq!(format!("{:X}", hello), "48656C6C6F20776F726C6421");
+    }
+
     #[test]
     fn test_factor() {
         fn factor(n: usize) -> BigUint {

From a89a2e82e69199f92823955ee6f2eb9dafb00489 Mon Sep 17 00:00:00 2001
From: Colin Davidson <colin@pentaquine.com>
Date: Sun, 17 Jan 2016 12:17:52 -0800
Subject: [PATCH 4/4] Fix test names

Upper and Lower test names were swapped
---
 src/bigint.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/bigint.rs b/src/bigint.rs
index 6255070..65edeb6 100644
--- a/src/bigint.rs
+++ b/src/bigint.rs
@@ -3724,7 +3724,7 @@ mod biguint_tests {
     }
 
     #[test]
-    fn test_upper_hex() {
+    fn test_lower_hex() {
         let a = BigUint::parse_bytes(b"A", 16).unwrap();
         let hello = BigUint::parse_bytes("22405534230753963835153736737".as_bytes(), 10).unwrap();
 
@@ -3733,7 +3733,7 @@ mod biguint_tests {
     }
 
     #[test]
-    fn test_lower_hex() {
+    fn test_upper_hex() {
         let a = BigUint::parse_bytes(b"A", 16).unwrap();
         let hello = BigUint::parse_bytes("22405534230753963835153736737".as_bytes(), 10).unwrap();