Implement serialization for NonZero values in nightly.

serde/Cargo.toml

@@ -11,3 +11,7 @@ keywords = ["serialization"]
 
 [dependencies]
 num = "*"
+
+[features]
+nightly = []
+

serde/src/de/impls.rs

@@ -9,6 +9,11 @@ use std::sync::Arc;
 
 use num::FromPrimitive;
 
+#[cfg(feature = "nightly")]
+use core::nonzero::{NonZero, Zeroable};
+#[cfg(feature = "nightly")]
+use std::num::Zero;
+
 use de::{
     Deserialize,
     Deserializer,
@@ -865,3 +870,18 @@ impl<'a, T: ?Sized> Deserialize for Cow<'a, T> where T: ToOwned, T::Owned: Deser
         Ok(Cow::Owned(val))
     }
 }
+
+///////////////////////////////////////////////////////////////////////////////
+
+impl<T> Deserialize for NonZero<T> where T: Deserialize + PartialEq + Zeroable + Zero {
+    fn deserialize<D>(deserializer: &mut D) -> Result<NonZero<T>, D::Error> where D: Deserializer {
+        let value = try!(Deserialize::deserialize(deserializer));
+        if value == Zero::zero() {
+            return Err(Error::syntax_error())
+        }
+        unsafe {
+            Ok(NonZero::new(value))
+        }
+    }
+}
+

serde/src/lib.rs

@@ -6,9 +6,13 @@
 //! leaving serde to perform roughly the same speed as a hand written serializer for a specific
 //! type.
 #![doc(html_root_url="http://erickt.github.io/rust-serde")]
+#![cfg_attr(feature = "nightly", feature(core, nonzero, zero_one))]
 
 extern crate num;
 
+#[cfg(feature = "nightly")]
+extern crate core;
+
 pub use ser::{Serialize, Serializer};
 pub use de::{Deserialize, Deserializer, Error};
 

serde/src/ser/impls.rs

@@ -5,6 +5,9 @@ use std::path;
 use std::rc::Rc;
 use std::sync::Arc;
 
+#[cfg(feature = "nightly")]
+use core::nonzero::{NonZero, Zeroable};
+
 use super::{
     Serialize,
     Serializer,
@@ -545,3 +548,10 @@ impl Serialize for path::PathBuf {
         self.to_str().unwrap().serialize(serializer)
     }
 }
+
+impl<T> Serialize for NonZero<T> where T: Serialize + Zeroable {
+    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error> where S: Serializer {
+        (**self).serialize(serializer)
+    }
+}
+