> That code worked through at least Rust 1.2. So, yes, Rust has removed an API since 1.0. That code was compiling in December 2016. How sure are you that this

> That code worked through at least Rust 1.2. So, yes, Rust has removed an API since 1.0. That code was compiling in December 2016. How sure are you that this was compiled with Rust 1.2 and not some old rustc? Here is a copy of the docs for Vec from June 2016: https://github.com/Manishearth/rust-internals-docs/blob/9419844ea1b96e808b84919572f9f917063a89d4/collections/vec/struct.Vec.html https://github.com/Manishearth/rust-internals-docs/blob/9419... There is no join method there. There is a join method on slices (which vectors dereference to). https://github.com/Manishearth/rust-internals-docs/blob/9419844ea1b96e808b84919572f9f917063a89d4/std/primitive.slice.html#L1401 https://github.com/Manishearth/rust-internals-docs/blob/9419... This method still exists. It used to take a delimeter argument, and works the same way today. https://play.rust-lang.org/?gist=13d19cd5dd33c1efb046cc69bec05d99&version=stable&backtrace=0 https://play.rust-lang.org/?gist=13d19cd5dd33c1efb046cc69bec... There have been various language tweaks, but Rust has not removed a (stable) API since 1.0.