Enable clippy linting.

Cargo.toml

@@ -11,7 +11,9 @@ repository = "https://github.com/ebfull/pairing"
 
 [dependencies]
 rand = "0.3"
-byteorder = "1.1"
+byteorder = "1.1.0"
+clippy = { version = "0.0.144", optional = true }
 
 [features]
 unstable-wnaf = []
+unstable-features = ["unstable-wnaf"]

src/lib.rs

@@ -1,5 +1,17 @@
+// This library relies on the Rust nightly compiler's `i128_type` feature.
 #![feature(i128_type)]
 
+// `clippy` is a code linting tool for improving code quality by catching
+// common mistakes or strange code patterns. If the `clippy` feature is
+// provided, it is enabled and all compiler warnings are prohibited.
+#![cfg_attr(feature = "clippy", deny(warnings))]
+#![cfg_attr(feature = "clippy", feature(plugin))]
+#![cfg_attr(feature = "clippy", plugin(clippy))]
+#![cfg_attr(feature = "clippy", allow(inline_always))]
+#![cfg_attr(feature = "clippy", allow(too_many_arguments))]
+
+// The compiler provides `test` (on nightly) for benchmarking tools, but
+// it's hidden behind a feature flag. Enable it if we're testing.
 #![cfg_attr(test, feature(test))]
 #[cfg(test)]
 extern crate test;