minor: Simplify

crates/project_model/src/cargo_workspace.rs

@@ -106,7 +106,7 @@ impl CargoConfig {
             UnsetTestCrates::Only(unset_test_crates) => CfgOverrides::Selective(
                 unset_test_crates
                     .iter()
-                    .map(|name| name.clone())
+                    .cloned()
                     .zip(iter::repeat_with(|| {
                         cfg::CfgDiff::new(Vec::new(), vec![cfg::CfgAtom::Flag("test".into())])
                             .unwrap()

crates/project_model/src/tests.rs

@@ -47,13 +47,12 @@ fn get_test_json_file<T: DeserializeOwned>(file: &str) -> T {
     fixup_paths(&mut json);
     return serde_json::from_value(json).unwrap();
 
-    fn fixup_paths(val: &mut serde_json::Value) -> () {
+    fn fixup_paths(val: &mut serde_json::Value) {
         match val {
             serde_json::Value::String(s) => replace_root(s, true),
             serde_json::Value::Array(vals) => vals.iter_mut().for_each(fixup_paths),
             serde_json::Value::Object(kvals) => kvals.values_mut().for_each(fixup_paths),
             serde_json::Value::Null | serde_json::Value::Bool(_) | serde_json::Value::Number(_) => {
-                ()
             }
         }
     }

crates/project_model/src/workspace.rs

@@ -189,7 +189,7 @@ impl ProjectWorkspace {
                     Some(rustc_dir) => Some({
                         let meta = CargoWorkspace::fetch_metadata(&rustc_dir, config, progress)
                             .with_context(|| {
-                                format!("Failed to read Cargo metadata for Rust sources")
+                                "Failed to read Cargo metadata for Rust sources".to_string()
                             })?;
                         CargoWorkspace::new(meta)
                     }),
@@ -328,12 +328,12 @@ impl ProjectWorkspace {
                         }
                         PackageRoot { is_local, include, exclude }
                     })
-                    .chain(sysroot.into_iter().map(|sysroot| PackageRoot {
+                    .chain(sysroot.iter().map(|sysroot| PackageRoot {
                         is_local: false,
                         include: vec![sysroot.root().to_path_buf()],
                         exclude: Vec::new(),
                     }))
-                    .chain(rustc.into_iter().flat_map(|rustc| {
+                    .chain(rustc.iter().flat_map(|rustc| {
                         rustc.packages().map(move |krate| PackageRoot {
                             is_local: false,
                             include: vec![rustc[krate].manifest.parent().to_path_buf()],
@@ -343,7 +343,7 @@ impl ProjectWorkspace {
                     .collect()
             }
             ProjectWorkspace::DetachedFiles { files, sysroot, .. } => files
-                .into_iter()
+                .iter()
                 .map(|detached_file| PackageRoot {
                     is_local: true,
                     include: vec![detached_file.clone()],
@@ -553,7 +553,7 @@ fn cargo_to_crate_graph(
                     &mut crate_graph,
                     &cargo[pkg],
                     build_scripts.outputs.get(pkg),
-                    &cfg_options,
+                    cfg_options,
                     load_proc_macro,
                     file_id,
                     &cargo[tgt].name,
@@ -815,17 +815,15 @@ fn add_target_crate_root(
             .map(|feat| CfgFlag::KeyValue { key: "feature".into(), value: feat.0.into() }),
     );
 
-    let crate_id = crate_graph.add_crate_root(
+    crate_graph.add_crate_root(
         file_id,
         edition,
         Some(display_name),
         cfg_options,
         potential_cfg_options,
         env,
         proc_macro,
-    );
-
-    crate_id
+    )
 }
 
 fn sysroot_to_crate_graph(
@@ -893,27 +891,27 @@ fn inject_cargo_env(package: &PackageData, env: &mut Env) {
     // CARGO_BIN_NAME, CARGO_BIN_EXE_<name>
 
     let manifest_dir = package.manifest.parent();
-    env.set("CARGO_MANIFEST_DIR".into(), manifest_dir.as_os_str().to_string_lossy().into_owned());
+    env.set("CARGO_MANIFEST_DIR", manifest_dir.as_os_str().to_string_lossy().into_owned());
 
     // Not always right, but works for common cases.
-    env.set("CARGO".into(), "cargo".into());
+    env.set("CARGO", "cargo".into());
 
-    env.set("CARGO_PKG_VERSION".into(), package.version.to_string());
-    env.set("CARGO_PKG_VERSION_MAJOR".into(), package.version.major.to_string());
-    env.set("CARGO_PKG_VERSION_MINOR".into(), package.version.minor.to_string());
-    env.set("CARGO_PKG_VERSION_PATCH".into(), package.version.patch.to_string());
-    env.set("CARGO_PKG_VERSION_PRE".into(), package.version.pre.to_string());
+    env.set("CARGO_PKG_VERSION", package.version.to_string());
+    env.set("CARGO_PKG_VERSION_MAJOR", package.version.major.to_string());
+    env.set("CARGO_PKG_VERSION_MINOR", package.version.minor.to_string());
+    env.set("CARGO_PKG_VERSION_PATCH", package.version.patch.to_string());
+    env.set("CARGO_PKG_VERSION_PRE", package.version.pre.to_string());
 
-    env.set("CARGO_PKG_AUTHORS".into(), String::new());
+    env.set("CARGO_PKG_AUTHORS", String::new());
 
-    env.set("CARGO_PKG_NAME".into(), package.name.clone());
+    env.set("CARGO_PKG_NAME", package.name.clone());
     // FIXME: This isn't really correct (a package can have many crates with different names), but
     // it's better than leaving the variable unset.
-    env.set("CARGO_CRATE_NAME".into(), CrateName::normalize_dashes(&package.name).to_string());
-    env.set("CARGO_PKG_DESCRIPTION".into(), String::new());
-    env.set("CARGO_PKG_HOMEPAGE".into(), String::new());
-    env.set("CARGO_PKG_REPOSITORY".into(), String::new());
-    env.set("CARGO_PKG_LICENSE".into(), String::new());
+    env.set("CARGO_CRATE_NAME", CrateName::normalize_dashes(&package.name).to_string());
+    env.set("CARGO_PKG_DESCRIPTION", String::new());
+    env.set("CARGO_PKG_HOMEPAGE", String::new());
+    env.set("CARGO_PKG_REPOSITORY", String::new());
+    env.set("CARGO_PKG_LICENSE", String::new());
 
-    env.set("CARGO_PKG_LICENSE_FILE".into(), String::new());
+    env.set("CARGO_PKG_LICENSE_FILE", String::new());
 }

crates/syntax/src/algo.rs

@@ -212,7 +212,7 @@ pub fn diff(from: &SyntaxNode, to: &SyntaxNode) -> TreeDiff {
                     look_ahead_scratch.push(rhs_ele.clone());
                     let mut rhs_children_clone = rhs_children.clone();
                     let mut insert = false;
-                    while let Some(rhs_child) = rhs_children_clone.next() {
+                    for rhs_child in &mut rhs_children_clone {
                         if syntax_element_eq(&lhs_ele, &rhs_child) {
                             cov_mark::hit!(diff_insertions);
                             insert = true;

crates/syntax/src/ast/make.rs

@@ -556,7 +556,7 @@ pub fn param(pat: ast::Pat, ty: ast::Type) -> ast::Param {
 }
 
 pub fn self_param() -> ast::SelfParam {
-    ast_from_text(&format!("fn f(&self) {{ }}"))
+    ast_from_text("fn f(&self) { }")
 }
 
 pub fn ret_type(ty: ast::Type) -> ast::RetType {

crates/test_utils/src/fixture.rs

@@ -346,7 +346,6 @@ impl MiniCore {
                 panic!("unused minicore flag: {:?}", flag);
             }
         }
-        format!("{}", buf);
         buf
     }
 }