One thing, he pointed out that his objection to the double colon is not why he rejected the proposal. Another thing, reading closely I think what he wanted to

One thing, he pointed out that his objection to the double colon is not why he rejected the proposal. Another thing, reading closely I think what he wanted to say (but maybe failed to communicate clearly) is that the double colon is a problematic lexical choice because in the slice syntax, it's already possible to have two colons in a row, but these should be lexed as separate tokens!