Fix clippy::borrowed_box lint in fbcode/eden/scm

Reviewed By: diliop

Differential Revision: D99974194

fbshipit-source-id: 864d80e2a184cb7652f3a232c4ecaea661ead8c3

Author: David Tolnay

eden/scm/lib/treestate/src/root.rs

@@ -59,7 +59,7 @@ impl TreeStateRoot {
         self.dirty = true;
     }
 
-    pub fn metadata(&self) -> &Box<[u8]> {
+    pub fn metadata(&self) -> &[u8] {
         &self.metadata
     }
 

eden/scm/lib/treestate/src/serialization.rs

@@ -97,13 +97,19 @@ impl Serializable for AggregatedState {
     }
 }
 
-impl Serializable for Box<[u8]> {
+impl Serializable for [u8] {
     fn serialize(&self, w: &mut dyn Write) -> Result<()> {
         w.write_vlq(self.len())?;
         w.write_all(self)?;
 
         Ok(())
     }
+}
+
+impl Serializable for Box<[u8]> {
+    fn serialize(&self, w: &mut dyn Write) -> Result<()> {
+        (**self).serialize(w)
+    }
 
     fn deserialize(r: &mut dyn Read) -> Result<Self> {
         let len: usize = r.read_vlq()?;

eden/scm/lib/treestate/src/treestate.rs

@@ -11,7 +11,6 @@ use std::collections::HashMap;
 use std::fmt;
 use std::io::Cursor;
 use std::iter::Iterator;
-use std::ops::Deref;
 use std::path::Path;
 use std::path::PathBuf;
 use std::str::FromStr;
@@ -398,7 +397,7 @@ impl TreeState {
     }
 
     pub fn metadata_bytes(&self) -> &[u8] {
-        self.root.metadata().deref()
+        self.root.metadata()
     }
 
     pub fn metadata(&self) -> Result<BTreeMap<String, String>> {