Mark `wnaf` module unstable via feature `unstable-wnaf`. Closes #13.

Cargo.toml

@@ -12,3 +12,6 @@ repository = "https://github.com/ebfull/pairing"
 [dependencies]
 rand = "0.3"
 byteorder = "1.1"
+
+[features]
+unstable-wnaf = []

src/lib.rs

@@ -11,6 +11,8 @@ extern crate byteorder;
 pub mod tests;
 
 pub mod bls12_381;
+
+#[cfg(feature = "unstable-wnaf")]
 pub mod wnaf;
 
 use std::fmt;

src/tests/curve.rs

@@ -62,6 +62,10 @@ pub fn curve_tests<G: CurveProjective>()
     random_encoding_tests::<G::Affine>();
 }
 
+#[cfg(not(feature = "unstable-wnaf"))]
+fn random_wnaf_tests<G: CurveProjective>() { }
+
+#[cfg(feature = "unstable-wnaf")]
 fn random_wnaf_tests<G: CurveProjective>() {
     use ::wnaf::*;
     use ::PrimeField;