From 0e13b3ca8ef7c44d72d04822c4885651f08c6f7f Mon Sep 17 00:00:00 2001
From: Thomas de Zeeuw <thomasdezeeuw@gmail.com>
Date: Mon, 29 Jan 2024 12:06:55 +0100
Subject: [PATCH] Handle a single qoute in local part of email

Previously this would panic because it didn't consider email address
where the local part was a single double qoute (DQUOTE).
---
 src/lib.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index 61fe358..2569f64 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -648,7 +648,8 @@ fn parse_local_part(part: &str) -> Result<(), Error> {
     } else if part.len() > LOCAL_PART_MAX_LENGTH {
         Error::LocalPartTooLong.into()
     } else if part.starts_with(DQUOTE) && part.ends_with(DQUOTE) {
-        if part.len() == 2 {
+        // <= to handle `part` = `"` (single quote).
+        if part.len() <= 2 {
             Error::LocalPartEmpty.into()
         } else {
             parse_quoted_local_part(&part[1..part.len() - 1])
@@ -1093,6 +1094,11 @@ mod tests {
             Error::LocalPartEmpty,
             Some("local-part is empty"),
         );
+        expect(
+            "\"@example.com",
+            Error::LocalPartEmpty,
+            Some("local-part is empty"),
+        );
     }
 
     #[test]