Function luaL_checkversion_

third-party/lua-5.2.4/src/lauxlib.c:944–958

LUALIB_API void luaL_checkversion_ (lua_State *L, lua_Number ver) {
  const lua_Number *v = lua_version(L);
  if (v != lua_version(NULL))
    luaL_error(L, "multiple Lua VMs detected");
  else if (*v != ver)
    luaL_error(L, "version mismatch: app. needs %f, Lua core provides %f",
                  ver, *v);
  /* check conversions number -> integer types */
  lua_pushnumber(L, -(lua_Number)0x1234);
  if (lua_tointeger(L, -1) != -0x1234 ||
      lua_tounsigned(L, -1) != (lua_Unsigned)-0x1234)
    luaL_error(L, "bad conversion number->int;"
                  " must recompile Lua with proper settings");
  lua_pop(L, 1);
}