impl Serialize and Deserialize for std::num::NonZero*

… gated on the `unstable` Cargo feature.

These are new standard library types.

serde/src/de/impls.rs

@@ -1918,6 +1918,7 @@ where
 ////////////////////////////////////////////////////////////////////////////////
 
 #[cfg(feature = "unstable")]
+#[allow(deprecated)]
 impl<'de, T> Deserialize<'de> for NonZero<T>
 where
     T: Deserialize<'de> + Zeroable,
@@ -1934,6 +1935,39 @@ where
     }
 }
 
+macro_rules! nonzero_integers {
+    ( @ $( $T: ty, )+ ) => {
+        $(
+            #[cfg(feature = "unstable")]
+            impl<'de> Deserialize<'de> for $T {
+                fn deserialize<D>(deserializer: D) -> Result<$T, D::Error>
+                where
+                    D: Deserializer<'de>,
+                {
+                    let value = try!(Deserialize::deserialize(deserializer));
+                    match <$T>::new(value) {
+                        Some(nonzero) => Ok(nonzero),
+                        None => Err(Error::custom("expected a non-zero value")),
+                    }
+                }
+            }
+        )+
+    };
+    ( $( $T: ident, )+ ) => {
+        nonzero_integers!(@ $(::lib::num::$T,)+ );
+    }
+}
+
+nonzero_integers! {
+    // Not including signed NonZeroI* since they might be removed
+    NonZeroU8,
+    NonZeroU16,
+    NonZeroU32,
+    NonZeroU64,
+    // FIXME: https://github.com/serde-rs/serde/issues/1136 NonZeroU128,
+    NonZeroUsize,
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 
 impl<'de, T, E> Deserialize<'de> for Result<T, E>

serde/src/de/mod.rs

@@ -99,6 +99,7 @@
 //!    - PathBuf
 //!    - Range\<T\>
 //!    - NonZero\<T\> (unstable)
+//!    - num::NonZero* (unstable)
 //!  - **Net types**:
 //!    - IpAddr
 //!    - Ipv4Addr

serde/src/lib.rs

@@ -211,7 +211,11 @@ mod lib {
     pub use std::sync::{Mutex, RwLock};
 
     #[cfg(feature = "unstable")]
+    #[allow(deprecated)]
     pub use core::nonzero::{NonZero, Zeroable};
+
+    #[cfg(feature = "unstable")]
+    pub use core::num;
 }
 
 ////////////////////////////////////////////////////////////////////////////////

serde/src/ser/impls.rs

@@ -351,6 +351,7 @@ deref_impl!(<'a, T: ?Sized> Serialize for Cow<'a, T> where T: Serialize + ToOwne
 ////////////////////////////////////////////////////////////////////////////////
 
 #[cfg(feature = "unstable")]
+#[allow(deprecated)]
 impl<T> Serialize for NonZero<T>
 where
     T: Serialize + Zeroable + Clone,
@@ -363,6 +364,32 @@ where
     }
 }
 
+macro_rules! nonzero_integers {
+    ( $( $T: ident, )+ ) => {
+        $(
+            #[cfg(feature = "unstable")]
+            impl Serialize for ::lib::num::$T {
+                fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+                where
+                    S: Serializer,
+                {
+                    self.get().serialize(serializer)
+                }
+            }
+        )+
+    }
+}
+
+nonzero_integers! {
+    // Not including signed NonZeroI* since they might be removed
+    NonZeroU8,
+    NonZeroU16,
+    NonZeroU32,
+    NonZeroU64,
+    // FIXME: https://github.com/serde-rs/serde/issues/1136 NonZeroU128,
+    NonZeroUsize,
+}
+
 impl<T> Serialize for Cell<T>
 where
     T: Serialize + Copy,

serde/src/ser/mod.rs

@@ -94,6 +94,7 @@
 //!    - PathBuf
 //!    - Range\<T\>
 //!    - NonZero\<T\> (unstable)
+//!    - num::NonZero* (unstable)
 //!  - **Net types**:
 //!    - IpAddr
 //!    - Ipv4Addr