--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/luajit/src/lj_assert.c	Fri Jan 23 22:38:59 2026 -0800
@@ -0,0 +1,28 @@
+/*
+** Internal assertions.
+** Copyright (C) 2005-2023 Mike Pall. See Copyright Notice in luajit.h
+*/
+
+#define lj_assert_c
+#define LUA_CORE
+
+#if defined(LUA_USE_ASSERT) || defined(LUA_USE_APICHECK)
+
+#include <stdio.h>
+
+#include "lj_obj.h"
+
+void lj_assert_fail(global_State *g, const char *file, int line,
+		    const char *func, const char *fmt, ...)
+{
+  va_list argp;
+  va_start(argp, fmt);
+  fprintf(stderr, "LuaJIT ASSERT %s:%d: %s: ", file, line, func);
+  vfprintf(stderr, fmt, argp);
+  fputc('\n', stderr);
+  va_end(argp);
+  UNUSED(g);  /* May be NULL. TODO: optionally dump state. */
+  abort();
+}
+
+#endif