From 04a1550cee062b2c3d3b310980a28bf110dd6d20 Mon Sep 17 00:00:00 2001
From: Thomas Castleman <thomascastleman0@gmail.com>
Date: Thu, 11 Nov 2021 12:26:59 -0500
Subject: [PATCH] `hex-literal`: ensure '/' as last byte causes error in
 `hex!()` (#665)

---
 hex-literal/CHANGELOG.md    | 3 +++
 hex-literal/src/comments.rs | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/hex-literal/CHANGELOG.md b/hex-literal/CHANGELOG.md
index 43edcac4..46e77e34 100644
--- a/hex-literal/CHANGELOG.md
+++ b/hex-literal/CHANGELOG.md
@@ -12,6 +12,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - More tests for `hex!()` macro
 - More internal documentation
 
+### Fixed
+- Make `hex!()` error when forward slash encountered as last byte
+
 ## 0.3.3 (2021-07-17)
 ### Added
 - Accept sequence of string literals ([#519])
diff --git a/hex-literal/src/comments.rs b/hex-literal/src/comments.rs
index 02dd6993..135e6d53 100644
--- a/hex-literal/src/comments.rs
+++ b/hex-literal/src/comments.rs
@@ -28,6 +28,8 @@ impl<I: Iterator<Item = u8>> Iterator for ExcludingComments<I> {
                 State::BlockComment | State::PotentiallyLeavingBlockComment => {
                     panic!("block comment not terminated with */")
                 }
+                // No more bytes after a single '/'
+                State::PotentialComment { .. } => panic!("encountered invalid character: `/`"),
                 _ => {}
             }
         }