Switch to edit mode.
Name(s): chan_opts1: $perm_utils:can_hack() || raise(E_PERM)
2: {id, @opts} = args
3: {members, history, atime, @oldopts} = `this:get_chan(id) ! E_INVARG => {{}, {}, 0}'
4: this:set_chan(id, {members, history, time(), @opts})