From 2c1aac277a983aa8a06fdd1cec2f03f2e5233b8d Mon Sep 17 00:00:00 2001
From: Roland Conybeare <rconybeare@gmail.com>
Date: Sun, 18 Jan 2026 20:23:00 -0500
Subject: [PATCH] xo-reader2: corrections to toplevel SchematikaParser setup

---
 include/xo/arena/DArena.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/xo/arena/DArena.hpp b/include/xo/arena/DArena.hpp
index 8d9372a..ffd710f 100644
--- a/include/xo/arena/DArena.hpp
+++ b/include/xo/arena/DArena.hpp
@@ -64,8 +64,9 @@ namespace xo {
 
             /** @brief Checkpoint for unwinding arena state **/
             struct Checkpoint {
+                Checkpoint() = default;
                 explicit Checkpoint(std::byte * x) : free_{x} {}
-                std::byte * free_;
+                std::byte * free_ = nullptr;
             };
 
             ///@}