chore: Implement Lookup/HashEqLike for Arc (#784)

Author: Veykril

src/interned.rs

@@ -6,6 +6,7 @@ use std::hash::{BuildHasher, Hash, Hasher};
 use std::marker::PhantomData;
 use std::path::{Path, PathBuf};
 use std::sync::atomic::{AtomicU8, Ordering};
+use std::sync::Arc;
 
 use dashmap::SharedValue;
 
@@ -542,6 +543,29 @@ where
     }
 }
 
+impl<'a, T> HashEqLike<&'a T> for Arc<T>
+where
+    T: ?Sized + Hash + Eq,
+    Arc<T>: From<&'a T>,
+{
+    fn hash<H: Hasher>(&self, h: &mut H) {
+        Hash::hash(self, &mut *h)
+    }
+    fn eq(&self, data: &&T) -> bool {
+        **self == **data
+    }
+}
+
+impl<'a, T> Lookup<Arc<T>> for &'a T
+where
+    T: ?Sized + Hash + Eq,
+    Arc<T>: From<&'a T>,
+{
+    fn into_owned(self) -> Arc<T> {
+        Arc::from(self)
+    }
+}
+
 impl Lookup<String> for &str {
     fn into_owned(self) -> String {
         self.to_owned()