// (find-esfile "lua5.e" "debug.mygetstack")
// (find-esfile "lua5.e" "debug.mygetstack-idea-1")
// http://lua-users.org/lists/lua-l/2019-05/msg00126.html my question
// http://lua-users.org/lists/lua-l/2019-05/msg00137.html Sean's last answer




#define TYPE_LUA_DEBUG  "lua_Debug"

luaL_newmetatable(L,TYPE_LUA_DEBUG);
/* add metamethods as you see fit */

static int mygetstack(lua_State *L)
{
  lua_Debug *par;
  int        level = luaL_checkinteger(L,1);

  par = lua_newuserdata(L,sizeof(lua_Debug));
  if (!lua_getstack(L,level,par))
    return 0;
  luaL_getmetatable(L,TYPE_LUA_DEBUG);
  lua_setmetatable(L,-2);
  return 1;
}