Minor clippy performance suggestions

crates/assists/src/handlers/add_missing_impl_members.rs

@@ -146,7 +146,7 @@ fn add_missing_impl_members_inner(
 
     let target = impl_def.syntax().text_range();
     acc.add(AssistId(assist_id, AssistKind::QuickFix), label, target, |builder| {
-        let impl_item_list = impl_def.assoc_item_list().unwrap_or(make::assoc_item_list());
+        let impl_item_list = impl_def.assoc_item_list().unwrap_or_else(make::assoc_item_list);
 
         let n_existing_items = impl_item_list.assoc_items().count();
         let source_scope = ctx.sema.scope_for_def(trait_);

crates/assists/src/handlers/extract_struct_from_enum_variant.rs

@@ -91,7 +91,7 @@ fn existing_struct_def(db: &RootDatabase, variant_name: &str, variant: &EnumVari
         .module(db)
         .scope(db, None)
         .into_iter()
-        .any(|(name, _)| name.to_string() == variant_name.to_string())
+        .any(|(name, _)| name.to_string() == variant_name)
 }
 
 #[allow(dead_code)]

crates/hir/src/code_model.rs

@@ -145,7 +145,7 @@ impl Crate {
             }
         }).flat_map(|t| t).next();
 
-        doc_url.map(|s| s.trim_matches('"').trim_end_matches("/").to_owned() + "/")
+        doc_url.map(|s| s.trim_matches('"').trim_end_matches('/').to_owned() + "/")
     }
 }
 

crates/ide/src/link_rewrite.rs

@@ -120,7 +120,7 @@ fn rewrite_intra_doc_link(
 
 /// Try to resolve path to local documentation via path-based links (i.e. `../gateway/struct.Shard.html`).
 fn rewrite_url_link(db: &RootDatabase, def: ModuleDef, target: &str) -> Option<String> {
-    if !(target.contains("#") || target.contains(".html")) {
+    if !(target.contains('#') || target.contains(".html")) {
         return None;
     }
 
@@ -190,7 +190,7 @@ fn strip_prefixes_suffixes(mut s: &str) -> &str {
         prefixes.clone().for_each(|prefix| s = s.trim_start_matches(*prefix));
         suffixes.clone().for_each(|suffix| s = s.trim_end_matches(*suffix));
     });
-    s.trim_start_matches("@").trim()
+    s.trim_start_matches('@').trim()
 }
 
 static TYPES: ([&str; 7], [&str; 0]) =

crates/ssr/src/resolving.rs

@@ -205,7 +205,7 @@ impl<'db> ResolutionScope<'db> {
 
     /// Returns the function in which SSR was invoked, if any.
     pub(crate) fn current_function(&self) -> Option<SyntaxNode> {
-        self.node.ancestors().find(|node| node.kind() == SyntaxKind::FN).map(|node| node.clone())
+        self.node.ancestors().find(|node| node.kind() == SyntaxKind::FN)
     }
 
     fn resolve_path(&self, path: &ast::Path) -> Option<hir::PathResolution> {

crates/syntax/src/ast/edit.rs

@@ -159,7 +159,7 @@ impl ast::AssocItemList {
         let whitespace =
             last_token_before_curly.clone().into_token().and_then(ast::Whitespace::cast)?;
         let text = whitespace.syntax().text();
-        let newline = text.rfind("\n")?;
+        let newline = text.rfind('\n')?;
         let keep = tokens::WsBuilder::new(&text[newline..]);
         Some(self.replace_children(
             first_token_after_items..=last_token_before_curly,