Merge pull request #1095 from dtolnay/hashtest

Resolve manual_hash_one lint in test

tests/test.rs

@@ -30,11 +30,12 @@ use serde_json::{
     from_reader, from_slice, from_str, from_value, json, to_string, to_string_pretty, to_value,
     to_vec, Deserializer, Number, Value,
 };
-use std::collections::hash_map::DefaultHasher;
 use std::collections::BTreeMap;
 #[cfg(feature = "raw_value")]
 use std::collections::HashMap;
 use std::fmt::{self, Debug};
+use std::hash::BuildHasher;
+#[cfg(feature = "raw_value")]
 use std::hash::{Hash, Hasher};
 use std::io;
 use std::iter;
@@ -2490,19 +2491,15 @@ fn test_value_into_deserializer() {
 
 #[test]
 fn hash_positive_and_negative_zero() {
-    fn hash(obj: impl Hash) -> u64 {
-        let mut hasher = DefaultHasher::new();
-        obj.hash(&mut hasher);
-        hasher.finish()
-    }
+    let rand = std::hash::RandomState::new();
 
     let k1 = serde_json::from_str::<Number>("0.0").unwrap();
     let k2 = serde_json::from_str::<Number>("-0.0").unwrap();
     if cfg!(feature = "arbitrary_precision") {
         assert_ne!(k1, k2);
-        assert_ne!(hash(k1), hash(k2));
+        assert_ne!(rand.hash_one(k1), rand.hash_one(k2));
     } else {
         assert_eq!(k1, k2);
-        assert_eq!(hash(k1), hash(k2));
+        assert_eq!(rand.hash_one(k1), rand.hash_one(k2));
     }
 }