Fix overflow in delimiter_of_raw_string at end of input

Author: dtolnay

src/parse.rs

@@ -468,22 +468,20 @@ fn cooked_byte_string(mut input: Cursor) -> Result<Cursor, Reject> {
 }
 
 fn delimiter_of_raw_string(input: Cursor) -> PResult<&str> {
-    let mut n = 0;
     for (i, byte) in input.bytes().enumerate() {
         match byte {
             b'"' => {
-                n = i;
-                break;
+                if i > 255 {
+                    // https://github.com/rust-lang/rust/pull/95251
+                    return Err(Reject);
+                }
+                return Ok((input.advance(i + 1), &input.rest[..i]));
             }
             b'#' => {}
-            _ => return Err(Reject),
+            _ => break,
         }
     }
-    if n > 255 {
-        // https://github.com/rust-lang/rust/pull/95251
-        return Err(Reject);
-    }
-    Ok((input.advance(n + 1), &input.rest[..n]))
+    Err(Reject)
 }
 
 fn raw_byte_string(input: Cursor) -> Result<Cursor, Reject> {