Merge pull request #1286 from dtolnay/into128

Implement IntoDeserializer for i128 and u128

serde/src/de/value.rs

@@ -218,6 +218,11 @@ primitive_deserializer!(f32, "an `f32`.", F32Deserializer, visit_f32);
 primitive_deserializer!(f64, "an `f64`.", F64Deserializer, visit_f64);
 primitive_deserializer!(char, "a `char`.", CharDeserializer, visit_char);
 
+serde_if_integer128! {
+    primitive_deserializer!(i128, "an `i128`.", I128Deserializer, visit_i128);
+    primitive_deserializer!(u128, "a `u128`.", U128Deserializer, visit_u128);
+}
+
 /// A deserializer holding a `u32`.
 #[derive(Clone, Debug)]
 pub struct U32Deserializer<E> {

test_suite/tests/test_value.rs

@@ -25,3 +25,21 @@ fn test_u32_to_enum() {
     let e: E = E::deserialize(deserializer).unwrap();
     assert_eq!(E::B, e);
 }
+
+#[test]
+fn test_integer128() {
+    let de_u128 = IntoDeserializer::<value::Error>::into_deserializer(1u128);
+    let de_i128 = IntoDeserializer::<value::Error>::into_deserializer(1i128);
+
+    // u128 to u128
+    assert_eq!(1u128, u128::deserialize(de_u128.clone()).unwrap());
+
+    // u128 to i128
+    assert_eq!(1i128, i128::deserialize(de_u128.clone()).unwrap());
+
+    // i128 to u128
+    assert_eq!(1u128, u128::deserialize(de_i128.clone()).unwrap());
+
+    // i128 to i128
+    assert_eq!(1i128, i128::deserialize(de_i128.clone()).unwrap());
+}