Compilation error when compiling example.rs

[samueldotj]

I am getting the following error when compiling example.rs

error: cannot find attribute `rustyline` in this scope
  --> src/main.rs:15:7
   |
15 |     #[rustyline(Completer)]
   |       ^^^^^^^^^
   |
   = note: `rustyline` is in scope, but it is a crate, not an attribute

error: cannot find attribute `rustyline` in this scope
  --> src/main.rs:18:7
   |
18 |     #[rustyline(Validator)]
   |       ^^^^^^^^^
   |
   = note: `rustyline` is in scope, but it is a crate, not an attribute

error: cannot find attribute `rustyline` in this scope
  --> src/main.rs:20:7
   |
20 |     #[rustyline(Hinter)]
   |       ^^^^^^^^^
   |
   = note: `rustyline` is in scope, but it is a crate, not an attribute

error: could not compile `x` due to 3 previous errors

I am new to rust so I might be doing something wrong.
I did cargo init and replaced content of main.rs with example.rs and added rustyline dependency on the cargo.toml.
example.rs is from https://github.com/kkawakam/rustyline/blob/master/examples/example.rs

Cargo.toml

cat ../Cargo.toml 
[package]
name = "x"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
rustyline="9.1"
rustyline-derive="0.6.0"
env_logger="0.9.0"

[gwenn]

You should not mix an example from a github master branch and a released version (9.1).
Either you use the example from master branch and the associated snapshot:

rustyline = { git = "https://github.com/kkawakam/rustyline/" }
rustyline-derive= { git = "https://github.com/kkawakam/rustyline/" }

Or you use the 0.9.1 version and the associated example from:

• github
• or your local repository $HOME/.cargo/registry/src/git.luolix.top-.../rustyline-9.1.2/examples/example.rs

The discrepancy comes from #621