Function remove 

pub fn remove(state: &mut LuaState) -> Result<usize, LuaError>

static int tremove (lua_State *L) {
  lua_Integer size = aux_getn(L, 1, TAB_RW);
  lua_Integer pos = luaL_optinteger(L, 2, size);
  if (pos != size)
    luaL_argcheck(L, (lua_Unsigned)pos - 1u <= (lua_Unsigned)size, 2,
                     "position out of bounds");
  lua_geti(L, 1, pos);
  for ( ; pos < size; pos++) {
    lua_geti(L, 1, pos + 1);
    lua_seti(L, 1, pos);
  }
  lua_pushnil(L);
  lua_seti(L, 1, pos);
  return 1;
}