From f0a3490e9797ce1f9677e623693ef2c587051b6e Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Sat, 4 Feb 2023 15:21:02 -0800
Subject: [PATCH 1/2] Add raw string literal test cases

---
 tests/test.rs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/tests/test.rs b/tests/test.rs
index 5a8e93fe..0033418e 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -5,6 +5,7 @@
 )]
 
 use proc_macro2::{Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
+use std::iter;
 use std::panic;
 use std::str::{self, FromStr};
 
@@ -118,6 +119,25 @@ fn literal_string() {
 #[test]
 fn literal_raw_string() {
     "r\"\r\n\"".parse::<TokenStream>().unwrap();
+
+    fn raw_string_literal_with_hashes(n: usize) -> String {
+        let mut literal = String::new();
+        literal.push('r');
+        literal.extend(iter::repeat('#').take(n));
+        literal.push('"');
+        literal.push('"');
+        literal.extend(iter::repeat('#').take(n));
+        literal
+    }
+
+    raw_string_literal_with_hashes(255)
+        .parse::<TokenStream>()
+        .unwrap();
+
+    // https://github.com/rust-lang/rust/pull/95251
+    raw_string_literal_with_hashes(256)
+        .parse::<TokenStream>()
+        .unwrap();
 }
 
 #[test]

From dffd53caa1ae33112be444c0e452ec4f8b046d56 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Sat, 4 Feb 2023 15:25:26 -0800
Subject: [PATCH 2/2] Reduce max hash in raw strings to 255

---
 src/parse.rs  | 4 ++++
 tests/test.rs | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/parse.rs b/src/parse.rs
index 307e0650..2a87948a 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -472,6 +472,10 @@ fn raw_string(input: Cursor) -> Result<Cursor, Reject> {
             _ => return Err(Reject),
         }
     }
+    if n > 255 {
+        // https://github.com/rust-lang/rust/pull/95251
+        return Err(Reject);
+    }
     while let Some((i, ch)) = chars.next() {
         match ch {
             '"' if input.rest[i + 1..].starts_with(&input.rest[..n]) => {
diff --git a/tests/test.rs b/tests/test.rs
index 0033418e..e0af1512 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -137,7 +137,7 @@ fn literal_raw_string() {
     // https://github.com/rust-lang/rust/pull/95251
     raw_string_literal_with_hashes(256)
         .parse::<TokenStream>()
-        .unwrap();
+        .unwrap_err();
 }
 
 #[test]