I love Rust's error messages, but I think they were trying to be a little too smart with the error reporting here and ended up relying too much on properties of the medium.
How the fuck do I tell which is which?

My hypothesis is that because #3 can only be a lower bound based on the phrasing of the sentence, and because #2 is an upper bound, the correct order is 2;4;1;3. But why do I have to do intermediate level English grammar exercises to read my error message?