needless_pass_by_value on annotation?

[Dandandan]

I use Rocket with Rust nightly. Clippy gives me this suggestion (that doesn't compile of course).

warning: this argument is passed by value, but not consumed in the function body
--> src/main.rs:23:1
|
23 | #[get("/")]
| ^^^^^^^^^^^ help: consider taking a reference instead &#[get("/")]
|
= note: #[warn(needless_pass_by_value)] on by default
= help: for further information visit https://github.com/Manishearth/rust-clippy/wiki#needless_pass_by_value

[Cxarli]

I just got the same warning. &#[get("/")] is not valid though. I'm also using Rocket, but it seems to come from Hyper.