another round of clippy lint fixes

crates/cargo-test-support/src/paths.rs

@@ -127,10 +127,8 @@ impl CargoPathExt for Path {
             if let Err(e) = remove_dir_all::remove_dir_all(self) {
                 panic!("failed to remove {:?}: {:?}", self, e)
             }
-        } else {
-            if let Err(e) = fs::remove_file(self) {
-                panic!("failed to remove {:?}: {:?}", self, e)
-            }
+        } else if let Err(e) = fs::remove_file(self) {
+            panic!("failed to remove {:?}: {:?}", self, e)
         }
     }
 

src/cargo/core/compiler/build_context/target_info.rs

@@ -408,13 +408,7 @@ impl TargetInfo {
 
         let error = str::from_utf8(&output.stderr).unwrap();
         let output = str::from_utf8(&output.stdout).unwrap();
-        Ok(parse_crate_type(
-            crate_type,
-            &process,
-            output,
-            error,
-            &mut output.lines(),
-        )?)
+        parse_crate_type(crate_type, &process, output, error, &mut output.lines())
     }
 
     /// Returns all the file types generated by rustc for the given mode/target_kind.

src/cargo/core/compiler/build_plan.rs

@@ -7,7 +7,7 @@
 //! dependencies on other Invocations.
 
 use std::collections::BTreeMap;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 
 use serde::Serialize;
 
@@ -63,10 +63,10 @@ impl Invocation {
         }
     }
 
-    pub fn add_output(&mut self, path: &PathBuf, link: &Option<PathBuf>) {
-        self.outputs.push(path.clone());
+    pub fn add_output(&mut self, path: &Path, link: &Option<PathBuf>) {
+        self.outputs.push(path.to_path_buf());
         if let Some(ref link) = *link {
-            self.links.insert(link.clone(), path.clone());
+            self.links.insert(link.clone(), path.to_path_buf());
         }
     }
 

src/cargo/core/compiler/custom_build.rs

@@ -750,7 +750,7 @@ pub fn build_map(cx: &mut Context<'_, '_>) -> CargoResult<()> {
 
         // Load any dependency declarations from a previous run.
         if unit.mode.is_run_custom_build() {
-            parse_previous_explicit_deps(cx, unit)?;
+            parse_previous_explicit_deps(cx, unit);
         }
 
         // We want to invoke the compiler deterministically to be cache-friendly
@@ -787,13 +787,12 @@ pub fn build_map(cx: &mut Context<'_, '_>) -> CargoResult<()> {
         }
     }
 
-    fn parse_previous_explicit_deps(cx: &mut Context<'_, '_>, unit: &Unit) -> CargoResult<()> {
+    fn parse_previous_explicit_deps(cx: &mut Context<'_, '_>, unit: &Unit) {
         let script_run_dir = cx.files().build_script_run_dir(unit);
         let output_file = script_run_dir.join("output");
         let (prev_output, _) = prev_build_output(cx, unit);
         let deps = BuildDeps::new(&output_file, prev_output.as_ref());
         cx.build_explicit_deps.insert(unit.clone(), deps);
-        Ok(())
     }
 }
 

src/cargo/core/compiler/job_queue.rs

@@ -780,14 +780,12 @@ impl<'cfg> DrainState<'cfg> {
         if err_state.is_some() {
             // Already encountered one error.
             log::warn!("{:?}", new_err);
+        } else if !self.active.is_empty() {
+            crate::display_error(&new_err, shell);
+            drop(shell.warn("build failed, waiting for other jobs to finish..."));
+            *err_state = Some(anyhow::format_err!("build failed"));
         } else {
-            if !self.active.is_empty() {
-                crate::display_error(&new_err, shell);
-                drop(shell.warn("build failed, waiting for other jobs to finish..."));
-                *err_state = Some(anyhow::format_err!("build failed"));
-            } else {
-                *err_state = Some(new_err);
-            }
+            *err_state = Some(new_err);
         }
     }
 
@@ -917,7 +915,7 @@ impl<'cfg> DrainState<'cfg> {
                 // thread to run the job.
                 doit(JobState {
                     id,
-                    messages: messages.clone(),
+                    messages,
                     output: Some(cx.bcx.config),
                     rmeta_required: Cell::new(rmeta_required),
                     _marker: marker::PhantomData,

src/cargo/core/compiler/mod.rs

@@ -24,7 +24,7 @@ use std::env;
 use std::ffi::{OsStr, OsString};
 use std::fs::{self, File};
 use std::io::{BufRead, Write};
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 use std::sync::Arc;
 
 use anyhow::Error;
@@ -276,7 +276,7 @@ fn rustc(cx: &mut Context<'_, '_>, unit: &Unit, exec: &Arc<dyn Executor>) -> Car
                 )?;
                 add_plugin_deps(&mut rustc, &script_outputs, &build_scripts, &root_output)?;
             }
-            add_custom_env(&mut rustc, &script_outputs, current_id, script_metadata)?;
+            add_custom_env(&mut rustc, &script_outputs, current_id, script_metadata);
         }
 
         for output in outputs.iter() {
@@ -396,17 +396,14 @@ fn rustc(cx: &mut Context<'_, '_>, unit: &Unit, exec: &Arc<dyn Executor>) -> Car
         build_script_outputs: &BuildScriptOutputs,
         current_id: PackageId,
         metadata: Option<Metadata>,
-    ) -> CargoResult<()> {
-        let metadata = match metadata {
-            Some(metadata) => metadata,
-            None => return Ok(()),
-        };
-        if let Some(output) = build_script_outputs.get(current_id, metadata) {
-            for &(ref name, ref value) in output.env.iter() {
-                rustc.env(name, value);
+    ) {
+        if let Some(metadata) = metadata {
+            if let Some(output) = build_script_outputs.get(current_id, metadata) {
+                for &(ref name, ref value) in output.env.iter() {
+                    rustc.env(name, value);
+                }
             }
         }
-        Ok(())
     }
 }
 
@@ -491,7 +488,7 @@ fn add_plugin_deps(
     rustc: &mut ProcessBuilder,
     build_script_outputs: &BuildScriptOutputs,
     build_scripts: &BuildScripts,
-    root_output: &PathBuf,
+    root_output: &Path,
 ) -> CargoResult<()> {
     let var = util::dylib_path_envvar();
     let search_path = rustc.get_env(var).unwrap_or_default();
@@ -515,7 +512,7 @@ fn add_plugin_deps(
 // Strip off prefixes like "native=" or "framework=" and filter out directories
 // **not** inside our output directory since they are likely spurious and can cause
 // clashes with system shared libraries (issue #3366).
-fn filter_dynamic_search_path<'a, I>(paths: I, root_output: &PathBuf) -> Vec<PathBuf>
+fn filter_dynamic_search_path<'a, I>(paths: I, root_output: &Path) -> Vec<PathBuf>
 where
     I: Iterator<Item = &'a PathBuf>,
 {
@@ -603,7 +600,7 @@ fn rustdoc(cx: &mut Context<'_, '_>, unit: &Unit) -> CargoResult<Work> {
         rustdoc.arg("--cfg").arg(&format!("feature=\"{}\"", feat));
     }
 
-    add_error_format_and_color(cx, &mut rustdoc, false)?;
+    add_error_format_and_color(cx, &mut rustdoc, false);
 
     if let Some(args) = cx.bcx.extra_args_for(unit) {
         rustdoc.args(args);
@@ -725,11 +722,7 @@ fn add_cap_lints(bcx: &BuildContext<'_, '_>, unit: &Unit, cmd: &mut ProcessBuild
 /// intercepting messages like rmeta artifacts, etc. rustc includes a
 /// "rendered" field in the JSON message with the message properly formatted,
 /// which Cargo will extract and display to the user.
-fn add_error_format_and_color(
-    cx: &Context<'_, '_>,
-    cmd: &mut ProcessBuilder,
-    pipelined: bool,
-) -> CargoResult<()> {
+fn add_error_format_and_color(cx: &Context<'_, '_>, cmd: &mut ProcessBuilder, pipelined: bool) {
     cmd.arg("--error-format=json");
     let mut json = String::from("--json=diagnostic-rendered-ansi");
     if pipelined {
@@ -764,8 +757,6 @@ fn add_error_format_and_color(
             _ => (),
         }
     }
-
-    Ok(())
 }
 
 fn build_base_args(
@@ -799,7 +790,7 @@ fn build_base_args(
     }
 
     add_path_args(bcx, unit, cmd);
-    add_error_format_and_color(cx, cmd, cx.rmeta_required(unit))?;
+    add_error_format_and_color(cx, cmd, cx.rmeta_required(unit));
 
     if !test {
         for crate_type in crate_types.iter() {

src/cargo/core/package.rs

@@ -607,9 +607,8 @@ impl<'a, 'cfg> Downloads<'a, 'cfg> {
     /// eventually be returned from `wait_for_download`. Returns `Some(pkg)` if
     /// the package is ready and doesn't need to be downloaded.
     pub fn start(&mut self, id: PackageId) -> CargoResult<Option<&'a Package>> {
-        Ok(self
-            .start_inner(id)
-            .chain_err(|| format!("failed to download `{}`", id))?)
+        self.start_inner(id)
+            .chain_err(|| format!("failed to download `{}`", id))
     }
 
     fn start_inner(&mut self, id: PackageId) -> CargoResult<Option<&'a Package>> {

src/cargo/core/profiles.rs

@@ -100,7 +100,7 @@ impl Profiles {
             requested_profile,
         };
 
-        Self::add_root_profiles(&mut profile_makers, &profiles)?;
+        Self::add_root_profiles(&mut profile_makers, &profiles);
 
         // Merge with predefined profiles.
         use std::collections::btree_map::Entry;
@@ -143,7 +143,7 @@ impl Profiles {
     fn add_root_profiles(
         profile_makers: &mut Profiles,
         profiles: &BTreeMap<InternedString, TomlProfile>,
-    ) -> CargoResult<()> {
+    ) {
         profile_makers.by_name.insert(
             InternedString::new("dev"),
             ProfileMaker::new(Profile::default_dev(), profiles.get("dev").cloned()),
@@ -153,7 +153,6 @@ impl Profiles {
             InternedString::new("release"),
             ProfileMaker::new(Profile::default_release(), profiles.get("release").cloned()),
         );
-        Ok(())
     }
 
     /// Returns the built-in profiles (not including dev/release, which are

src/cargo/core/summary.rs

@@ -108,7 +108,7 @@ impl Summary {
         if !weak_dep_features {
             for (feat_name, features) in self.features() {
                 for fv in features {
-                    if matches!(fv, FeatureValue::DepFeature{weak: true, ..}) {
+                    if matches!(fv, FeatureValue::DepFeature { weak: true, .. }) {
                         bail!(
                             "optional dependency features with `?` syntax are only \
                              allowed on the nightly channel and requires the \
@@ -416,7 +416,14 @@ impl FeatureValue {
 
     /// Returns `true` if this feature explicitly used `dep:` syntax.
     pub fn has_dep_prefix(&self) -> bool {
-        matches!(self, FeatureValue::Dep{..} | FeatureValue::DepFeature{dep_prefix:true, ..})
+        matches!(
+            self,
+            FeatureValue::Dep { .. }
+                | FeatureValue::DepFeature {
+                    dep_prefix: true,
+                    ..
+                }
+        )
     }
 }
 

src/cargo/core/workspace.rs

@@ -437,14 +437,14 @@ impl<'cfg> Workspace<'cfg> {
     /// Returns an error if `manifest_path` isn't actually a valid manifest or
     /// if some other transient error happens.
     fn find_root(&mut self, manifest_path: &Path) -> CargoResult<Option<PathBuf>> {
-        fn read_root_pointer(member_manifest: &Path, root_link: &str) -> CargoResult<PathBuf> {
+        fn read_root_pointer(member_manifest: &Path, root_link: &str) -> PathBuf {
             let path = member_manifest
                 .parent()
                 .unwrap()
                 .join(root_link)
                 .join("Cargo.toml");
             debug!("find_root - pointer {}", path.display());
-            Ok(paths::normalize_path(&path))
+            paths::normalize_path(&path)
         }
 
         {
@@ -456,7 +456,7 @@ impl<'cfg> Workspace<'cfg> {
                 }
                 WorkspaceConfig::Member {
                     root: Some(ref path_to_root),
-                } => return Ok(Some(read_root_pointer(manifest_path, path_to_root)?)),
+                } => return Ok(Some(read_root_pointer(manifest_path, path_to_root))),
                 WorkspaceConfig::Member { root: None } => {}
             }
         }
@@ -481,7 +481,7 @@ impl<'cfg> Workspace<'cfg> {
                         root: Some(ref path_to_root),
                     } => {
                         debug!("find_root - found pointer");
-                        return Ok(Some(read_root_pointer(&ances_manifest_path, path_to_root)?));
+                        return Ok(Some(read_root_pointer(&ances_manifest_path, path_to_root)));
                     }
                     WorkspaceConfig::Member { .. } => {}
                 }
@@ -957,7 +957,7 @@ impl<'cfg> Workspace<'cfg> {
         if self.allows_new_cli_feature_behavior() {
             self.members_with_features_new(specs, requested_features)
         } else {
-            self.members_with_features_old(specs, requested_features)
+            Ok(self.members_with_features_old(specs, requested_features))
         }
     }
 
@@ -1067,7 +1067,7 @@ impl<'cfg> Workspace<'cfg> {
         &self,
         specs: &[PackageIdSpec],
         requested_features: &RequestedFeatures,
-    ) -> CargoResult<Vec<(&Package, RequestedFeatures)>> {
+    ) -> Vec<(&Package, RequestedFeatures)> {
         // Split off any features with the syntax `member-name/feature-name` into a map
         // so that those features can be applied directly to those workspace-members.
         let mut member_specific_features: HashMap<&str, BTreeSet<InternedString>> = HashMap::new();
@@ -1131,7 +1131,7 @@ impl<'cfg> Workspace<'cfg> {
                 }
             }
         });
-        Ok(ms.collect())
+        ms.collect()
     }
 }
 

src/cargo/ops/cargo_compile.rs

@@ -282,7 +282,7 @@ pub fn compile_ws<'a>(
     let bcx = create_bcx(ws, options, &interner)?;
     if options.build_config.unit_graph {
         unit_graph::emit_serialized_unit_graph(&bcx.roots, &bcx.unit_graph)?;
-        return Ok(Compilation::new(&bcx)?);
+        return Compilation::new(&bcx);
     }
 
     let _p = profile::start("compiling");