Remove some redundant allocations

crates/assists/src/handlers/extract_struct_from_enum_variant.rs

@@ -212,7 +212,7 @@ fn update_reference(
         find_node_at_offset::<ast::PathExpr>(source_file.syntax(), offset)
     {
         // tuple variant
-        (path_expr.path()?.segment()?, path_expr.syntax().parent()?.clone())
+        (path_expr.path()?.segment()?, path_expr.syntax().parent()?)
     } else if let Some(record_expr) =
         find_node_at_offset::<ast::RecordExpr>(source_file.syntax(), offset)
     {

crates/assists/src/handlers/qualify_path.rs

@@ -150,7 +150,7 @@ impl QualifyCandidate<'_> {
                 import,
                 trait_method_name,
                 generics,
-                match arg_list.clone() {
+                match arg_list {
                     Some(args) => make::arg_list(iter::once(receiver).chain(args)),
                     None => make::arg_list(iter::once(receiver)),
                 }

crates/cfg/src/dnf.rs

@@ -30,7 +30,7 @@ impl DnfExpr {
     pub fn new(expr: CfgExpr) -> Self {
         let builder = Builder { expr: DnfExpr { conjunctions: Vec::new() } };
 
-        builder.lower(expr.clone())
+        builder.lower(expr)
     }
 
     /// Computes a list of present or absent atoms in `opts` that cause this expression to evaluate

crates/completion/src/completions/unqualified_path.rs

@@ -147,7 +147,7 @@ fn fuzzy_completion(acc: &mut Completions, ctx: &CompletionContext) -> Option<()
     .filter_map(|(import_path, definition)| {
         render_resolution_with_import(
             RenderContext::new(ctx),
-            ImportEdit { import_path: import_path.clone(), import_scope: import_scope.clone() },
+            ImportEdit { import_path, import_scope: import_scope.clone() },
             &definition,
         )
     });

crates/completion/src/render/function.rs

@@ -91,7 +91,7 @@ impl<'a> FunctionRender<'a> {
             .zip(params_ty)
             .flat_map(|(pat, param_ty)| {
                 let pat = pat?;
-                let name = pat.to_string();
+                let name = pat;
                 let arg = name.trim_start_matches("mut ").trim_start_matches('_');
                 Some(self.add_arg(arg, param_ty.ty()))
             })

crates/project_model/src/workspace.rs

@@ -475,7 +475,7 @@ fn add_target_crate_root(
         Some(display_name),
         cfg_options,
         env,
-        proc_macro.clone(),
+        proc_macro,
     );
 
     crate_id

crates/rust-analyzer/src/main_loop.rs

@@ -658,7 +658,6 @@ impl GlobalState {
         log::trace!("updating notifications for {:?}", subscriptions);
         if self.config.publish_diagnostics {
             let snapshot = self.snapshot();
-            let subscriptions = subscriptions.clone();
             self.task_pool.handle.spawn(move || {
                 let diagnostics = subscriptions
                     .into_iter()

crates/syntax/src/ast/node_ext.rs

@@ -55,7 +55,7 @@ impl ast::Attr {
         let key = self.simple_name()?;
         let value_token = lit.syntax().first_token()?;
 
-        let value: SmolStr = ast::String::cast(value_token.clone())?.value()?.into();
+        let value: SmolStr = ast::String::cast(value_token)?.value()?.into();
 
         Some((key, value))
     }

crates/syntax/src/ast/token_ext.rs

@@ -599,7 +599,7 @@ impl ast::IntNumber {
         text = &text[radix.prefix_len()..];
 
         let buf;
-        if text.contains("_") {
+        if text.contains('_') {
             buf = text.replace('_', "");
             text = buf.as_str();
         };

xtask/src/codegen/gen_assists_docs.rs

@@ -134,7 +134,7 @@ r#####"
 
         buf.push_str(&test)
     }
-    let buf = reformat(&buf.to_string())?;
+    let buf = reformat(&buf)?;
     codegen::update(&project_root().join("crates/assists/src/tests/generated.rs"), &buf, mode)
 }