[glandium]

It's the same in at least Python, so it's not a Rust idiosyncratic behavior. The "absolutize" method you're asking for exists since 1.79. https://doc.rust-lang.org/stable/std/path/fn.absolute.html

[Sharlin]

Yeah, but I meant a method that would take a custom prefix, like join does now. (In the hypothetical situation where join had different semantics.)