Add clippy as an optional dependency (enabled via `cargo build --features clippy`)

codegen/Cargo.toml

@@ -18,6 +18,10 @@ plugin = true
 rocket = { version = "0.1.4", path = "../lib/" }
 log = "^0.3"
 
+[dependencies.clippy]
+version = ">=0.0.106"
+optional = true
+
 [dev-dependencies]
 compiletest_rs = "^0.2"
 

codegen/src/lib.rs

@@ -95,6 +95,9 @@
 #![feature(i128_type)]
 #![allow(unused_attributes)]
 #![allow(deprecated)]
+#![cfg_attr(feature="clippy", feature(plugin))]
+#![cfg_attr(feature="clippy", plugin(clippy))]
+#![cfg_attr(feature="clippy", allow(needless_lifetimes))]
 
 #[macro_use] extern crate syntax;
 #[macro_use] extern crate log;

contrib/Cargo.toml

@@ -33,3 +33,7 @@ handlebars = { version = "^0.23", optional = true, features = ["serde_type"] }
 glob = { version = "^0.2", optional = true }
 lazy_static = { version = "^0.2", optional = true }
 tera = { version = "^0.6", optional = true }
+
+[dependencies.clippy]
+version = ">=0.0.106"
+optional = true

contrib/src/lib.rs

@@ -29,6 +29,10 @@
 //! This crate is expected to grow with time, bringing in outside crates to be
 //! officially supported by Rocket.
 
+#![cfg_attr(feature="clippy", feature(plugin))]
+#![cfg_attr(feature="clippy", plugin(clippy))]
+#![cfg_attr(feature="clippy", allow(needless_lifetimes))]
+
 #[macro_use] extern crate log;
 #[macro_use] extern crate rocket;
 

lib/Cargo.toml

@@ -20,6 +20,10 @@ url = "^1"
 toml = "^0.2"
 # cookie = "^0.3"
 
+[dependencies.clippy]
+version = ">=0.0.106"
+optional = true
+
 [dependencies.hyper]
 version = "^0.9"
 default-features = false

lib/src/lib.rs

@@ -4,6 +4,9 @@
 #![feature(associated_consts)]
 #![feature(const_fn)]
 #![feature(type_ascription)]
+#![cfg_attr(feature="clippy", feature(plugin))]
+#![cfg_attr(feature="clippy", plugin(clippy))]
+#![cfg_attr(feature="clippy", allow(needless_lifetimes))]
 
 //! # Rocket - Core API Documentation
 //!