From 5ed5a542fb6741b643c07855625cfd1531c10e2e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lauren=C8=9Biu=20Nicola?= <lnicola@dend.ro>
Date: Mon, 25 Jan 2021 14:12:53 +0200
Subject: [PATCH] Derive Default on ItemTree

---
 crates/hir_def/src/item_tree.rs       | 13 ++-----------
 crates/hir_def/src/item_tree/lower.rs |  2 +-
 2 files changed, 3 insertions(+), 12 deletions(-)

diff --git a/crates/hir_def/src/item_tree.rs b/crates/hir_def/src/item_tree.rs
index b8d7608e7c..1e5c946604 100644
--- a/crates/hir_def/src/item_tree.rs
+++ b/crates/hir_def/src/item_tree.rs
@@ -66,7 +66,7 @@ impl GenericParamsId {
 }
 
 /// The item tree of a source file.
-#[derive(Debug, Eq, PartialEq)]
+#[derive(Debug, Default, Eq, PartialEq)]
 pub struct ItemTree {
     _c: Count<Self>,
 
@@ -82,7 +82,7 @@ impl ItemTree {
         let syntax = if let Some(node) = db.parse_or_expand(file_id) {
             node
         } else {
-            return Arc::new(Self::empty());
+            return Default::default();
         };
 
         let hygiene = Hygiene::new(db.upcast(), file_id);
@@ -118,15 +118,6 @@ impl ItemTree {
         Arc::new(item_tree)
     }
 
-    fn empty() -> Self {
-        Self {
-            _c: Count::new(),
-            top_level: Default::default(),
-            attrs: Default::default(),
-            data: Default::default(),
-        }
-    }
-
     fn shrink_to_fit(&mut self) {
         if let Some(data) = &mut self.data {
             let ItemTreeData {
diff --git a/crates/hir_def/src/item_tree/lower.rs b/crates/hir_def/src/item_tree/lower.rs
index ce470fc3bf..8a71376b99 100644
--- a/crates/hir_def/src/item_tree/lower.rs
+++ b/crates/hir_def/src/item_tree/lower.rs
@@ -43,7 +43,7 @@ pub(super) struct Ctx {
 impl Ctx {
     pub(super) fn new(db: &dyn DefDatabase, hygiene: Hygiene, file: HirFileId) -> Self {
         Self {
-            tree: ItemTree::empty(),
+            tree: ItemTree::default(),
             hygiene,
             file,
             source_ast_id_map: db.ast_id_map(file),