[auroranil]

Then why not use word "plus" instead? "Proving that 1 plus 1 = 2 in Rust" is a more suitable title that does not use symbol +.

[jwilk]

AIUI, it was not the submitter who rewrote the title; HN did it automatically.

See https://news.ycombinator.com/item?id=14944003 for another submission that had this issue.