#define lua_ensure(...) _XBT_IF_ONE_ARG(_lua_ensure_ARG1, _lua_ensure_ARGN, __VA_ARGS__)(__VA_ARGS__)
#define _lua_ensure_ARG1(cond) _lua_ensure_ARGN(cond, "Assertion %s failed", #cond)
#define _lua_ensure_ARGN(cond, ...) \
#define lua_ensure(...) _XBT_IF_ONE_ARG(_lua_ensure_ARG1, _lua_ensure_ARGN, __VA_ARGS__)(__VA_ARGS__)
#define _lua_ensure_ARG1(cond) _lua_ensure_ARGN(cond, "Assertion %s failed", #cond)
#define _lua_ensure_ARGN(cond, ...) \