message: Rename parameter to avoid shadowing.
diff: #include "NovelImageRect.h"
  #include "NovelCommonArgs.h"
  #include "NovelLayeringService.h"
  -#include "NovelInteractionService.h"
  extern "C" {
  #include <lua.h>
  @@ -14,14 +13,14 @@ extern "C" {
  lua_State* L;
  -static int average(lua_State* L) {
  - int n = lua_gettop(L);
  +static int average(lua_State* luaState) {
  + int n = lua_gettop(luaState);
  double sum = 0;
  for (int i = 1; i <= n; i++) {
  - sum += lua_tonumber(L, i);
  + sum += lua_tonumber(luaState, i);
  }
  - lua_pushnumber(L, sum / n);
  - lua_pushnumber(L, sum);
  + lua_pushnumber(luaState, sum / n);
  + lua_pushnumber(luaState, sum);
  return 2;
  }
  