Rollup merge of rust-lang#146770 - hkBst:clippy-fix-10, r=fmease

fixes for numerous clippy warnings

Author: matthiaskrgr

compiler/rustc_driver_impl/src/lib.rs

@@ -206,7 +206,7 @@ impl Callbacks for TimePassesCallbacks {
         // time because it will mess up the --print output. See #64339.
         //
         self.time_passes = (config.opts.prints.is_empty() && config.opts.unstable_opts.time_passes)
-            .then(|| config.opts.unstable_opts.time_passes_format);
+            .then_some(config.opts.unstable_opts.time_passes_format);
         config.opts.trimmed_def_paths = true;
     }
 }
@@ -439,8 +439,9 @@ fn make_input(early_dcx: &EarlyDiagCtxt, free_matches: &[String]) -> Option<Inpu
                         "when UNSTABLE_RUSTDOC_TEST_PATH is set \
                                     UNSTABLE_RUSTDOC_TEST_LINE also needs to be set",
                     );
-                    let line = isize::from_str_radix(&line, 10)
-                        .expect("UNSTABLE_RUSTDOC_TEST_LINE needs to be an number");
+                    let line = line
+                        .parse::<isize>()
+                        .expect("UNSTABLE_RUSTDOC_TEST_LINE needs to be a number");
                     FileName::doc_test_source_code(PathBuf::from(path), line)
                 }
                 Err(_) => FileName::anon_source_code(&input),
@@ -474,8 +475,7 @@ fn handle_explain(early_dcx: &EarlyDiagCtxt, registry: Registry, code: &str, col
         let mut text = String::new();
         // Slice off the leading newline and print.
         for line in description.lines() {
-            let indent_level =
-                line.find(|c: char| !c.is_whitespace()).unwrap_or_else(|| line.len());
+            let indent_level = line.find(|c: char| !c.is_whitespace()).unwrap_or(line.len());
             let dedented_line = &line[indent_level..];
             if dedented_line.starts_with("```") {
                 is_in_code_block = !is_in_code_block;
@@ -547,7 +547,7 @@ fn show_md_content_with_pager(content: &str, color: ColorConfig) {
 
     // The pager failed. Try to print pretty output to stdout.
     if let Some((bufwtr, mdbuf)) = &pretty_data
-        && bufwtr.print(&mdbuf).is_ok()
+        && bufwtr.print(mdbuf).is_ok()
     {
         return;
     }
@@ -598,8 +598,7 @@ fn process_rlink(sess: &Session, compiler: &interface::Compiler) {
 
 fn list_metadata(sess: &Session, metadata_loader: &dyn MetadataLoader) {
     match sess.io.input {
-        Input::File(ref ifile) => {
-            let path = &(*ifile);
+        Input::File(ref path) => {
             let mut v = Vec::new();
             locator::list_file_metadata(
                 &sess.target,
@@ -833,7 +832,7 @@ fn print_crate_info(
             SupportedCrateTypes => {
                 let supported_crate_types = CRATE_TYPES
                     .iter()
-                    .filter(|(_, crate_type)| !invalid_output_for_target(&sess, *crate_type))
+                    .filter(|(_, crate_type)| !invalid_output_for_target(sess, *crate_type))
                     .filter(|(_, crate_type)| *crate_type != CrateType::Sdylib)
                     .map(|(crate_type_sym, _)| *crate_type_sym)
                     .collect::<BTreeSet<_>>();
@@ -1434,7 +1433,7 @@ pub fn install_ice_hook(bug_report_url: &'static str, extra_info: fn(&DiagCtxt))
                 eprintln!();
 
                 if let Some(ice_path) = ice_path()
-                    && let Ok(mut out) = File::options().create(true).append(true).open(&ice_path)
+                    && let Ok(mut out) = File::options().create(true).append(true).open(ice_path)
                 {
                     // The current implementation always returns `Some`.
                     let location = info.location().unwrap();
@@ -1510,7 +1509,7 @@ fn report_ice(
 
     let file = if let Some(path) = ice_path() {
         // Create the ICE dump target file.
-        match crate::fs::File::options().create(true).append(true).open(&path) {
+        match crate::fs::File::options().create(true).append(true).open(path) {
             Ok(mut file) => {
                 dcx.emit_note(session_diagnostics::IcePath { path: path.clone() });
                 if FIRST_PANIC.swap(false, Ordering::SeqCst) {

compiler/rustc_driver_impl/src/print.rs

@@ -14,7 +14,7 @@ macro_rules! safe_println {
 }
 
 pub(crate) fn print(args: fmt::Arguments<'_>) {
-    if let Err(_) = io::stdout().write_fmt(args) {
+    if io::stdout().write_fmt(args).is_err() {
         rustc_errors::FatalError.raise();
     }
 }

compiler/rustc_hir_typeck/src/lib.rs

@@ -254,7 +254,7 @@ fn typeck_with_inspect<'tcx>(
     }
 
     fcx.select_obligations_where_possible(|_| {});
-    if let None = fcx.infcx.tainted_by_errors() {
+    if fcx.infcx.tainted_by_errors().is_none() {
         fcx.report_ambiguity_errors();
     }
 
@@ -295,7 +295,7 @@ fn infer_type_if_missing<'tcx>(fcx: &FnCtxt<'_, 'tcx>, node: Node<'tcx>) -> Opti
     } else if let Node::AnonConst(_) = node {
         let id = tcx.local_def_id_to_hir_id(def_id);
         match tcx.parent_hir_node(id) {
-            Node::Ty(&hir::Ty { kind: hir::TyKind::Typeof(ref anon_const), span, .. })
+            Node::Ty(&hir::Ty { kind: hir::TyKind::Typeof(anon_const), span, .. })
                 if anon_const.hir_id == id =>
             {
                 Some(fcx.next_ty_var(span))

compiler/rustc_hir_typeck/src/upvar.rs

@@ -421,7 +421,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         // Not all upvars are captured by ref, so use
                         // `apply_capture_kind_on_capture_ty` to ensure that we
                         // compute the right captured type.
-                        return apply_capture_kind_on_capture_ty(
+                        apply_capture_kind_on_capture_ty(
                             self.tcx,
                             upvar_ty,
                             capture,
@@ -430,7 +430,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                             } else {
                                 self.tcx.lifetimes.re_erased
                             },
-                        );
+                        )
                     },
                 ),
             );
@@ -529,11 +529,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         // process any deferred resolutions.
         let deferred_call_resolutions = self.remove_deferred_call_resolutions(closure_def_id);
         for deferred_call_resolution in deferred_call_resolutions {
-            deferred_call_resolution.resolve(&mut FnCtxt::new(
-                self,
-                self.param_env,
-                closure_def_id,
-            ));
+            deferred_call_resolution.resolve(&FnCtxt::new(self, self.param_env, closure_def_id));
         }
     }
 
@@ -1493,7 +1489,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     /// Notation:
     /// - Ty(place): Type of place
     /// - `(a, b)`: Represents the function parameters `base_path_ty` and `captured_by_move_projs`
-    /// respectively.
+    ///   respectively.
     /// ```ignore (illustrative)
     ///                  (Ty(w), [ &[p, x], &[c] ])
     /// //                              |
@@ -2179,9 +2175,10 @@ fn restrict_precision_for_unsafe(
     (place, curr_mode)
 }
 
-/// Truncate projections so that following rules are obeyed by the captured `place`:
+/// Truncate projections so that the following rules are obeyed by the captured `place`:
 /// - No Index projections are captured, since arrays are captured completely.
-/// - No unsafe block is required to capture `place`
+/// - No unsafe block is required to capture `place`.
+///
 /// Returns the truncated place and updated capture mode.
 fn restrict_capture_precision(
     place: Place<'_>,

compiler/rustc_hir_typeck/src/writeback.rs

@@ -220,7 +220,7 @@ impl<'cx, 'tcx> WritebackCx<'cx, 'tcx> {
     // to use builtin indexing because the index type is known to be
     // usize-ish
     fn fix_index_builtin_expr(&mut self, e: &hir::Expr<'_>) {
-        if let hir::ExprKind::Index(ref base, ref index, _) = e.kind {
+        if let hir::ExprKind::Index(base, index, _) = e.kind {
             // All valid indexing looks like this; might encounter non-valid indexes at this point.
             let base_ty = self.typeck_results.expr_ty_adjusted(base);
             if let ty::Ref(_, base_ty_inner, _) = *base_ty.kind() {
@@ -583,7 +583,7 @@ impl<'cx, 'tcx> WritebackCx<'cx, 'tcx> {
             }
 
             if let Err(err) = opaque_type_has_defining_use_args(
-                &self.fcx,
+                self.fcx,
                 opaque_type_key,
                 hidden_type.span,
                 DefiningScopeKind::HirTypeck,
@@ -792,7 +792,7 @@ impl<'cx, 'tcx> WritebackCx<'cx, 'tcx> {
 
     fn visit_potentially_region_dependent_goals(&mut self) {
         let obligations = self.fcx.take_hir_typeck_potentially_region_dependent_goals();
-        if let None = self.fcx.tainted_by_errors() {
+        if self.fcx.tainted_by_errors().is_none() {
             for obligation in obligations {
                 let (predicate, mut cause) =
                     self.fcx.resolve_vars_if_possible((obligation.predicate, obligation.cause));

compiler/rustc_interface/src/passes.rs

@@ -192,7 +192,7 @@ fn configure_and_expand(
             unsafe {
                 env::set_var(
                     "PATH",
-                    &env::join_paths(
+                    env::join_paths(
                         new_path.iter().filter(|p| env::join_paths(iter::once(p)).is_ok()),
                     )
                     .unwrap(),
@@ -446,7 +446,7 @@ fn early_lint_checks(tcx: TyCtxt<'_>, (): ()) {
                 let prev_source = sess.psess.source_map().span_to_prev_source(first_span);
                 let ferris_fix = prev_source
                     .map_or(FerrisFix::SnakeCase, |source| {
-                        let mut source_before_ferris = source.trim_end().split_whitespace().rev();
+                        let mut source_before_ferris = source.split_whitespace().rev();
                         match source_before_ferris.next() {
                             Some("struct" | "trait" | "mod" | "union" | "type" | "enum") => {
                                 FerrisFix::PascalCase
@@ -500,7 +500,7 @@ fn env_var_os<'tcx>(tcx: TyCtxt<'tcx>, key: &'tcx OsStr) -> Option<&'tcx OsStr>
     // properly change-tracked.
     tcx.sess.psess.env_depinfo.borrow_mut().insert((
         Symbol::intern(&key.to_string_lossy()),
-        value.as_ref().and_then(|value| value.to_str()).map(|value| Symbol::intern(&value)),
+        value.as_ref().and_then(|value| value.to_str()).map(|value| Symbol::intern(value)),
     ));
 
     value_tcx
@@ -824,7 +824,7 @@ pub fn write_dep_info(tcx: TyCtxt<'_>) {
 
     let outputs = tcx.output_filenames(());
     let output_paths =
-        generated_output_paths(tcx, &outputs, sess.io.output_file.is_some(), crate_name);
+        generated_output_paths(tcx, outputs, sess.io.output_file.is_some(), crate_name);
 
     // Ensure the source file isn't accidentally overwritten during compilation.
     if let Some(input_path) = sess.io.input.opt_path() {
@@ -847,7 +847,7 @@ pub fn write_dep_info(tcx: TyCtxt<'_>) {
         }
     }
 
-    write_out_deps(tcx, &outputs, &output_paths);
+    write_out_deps(tcx, outputs, &output_paths);
 
     let only_dep_info = sess.opts.output_types.contains_key(&OutputType::DepInfo)
         && sess.opts.output_types.len() == 1;
@@ -1303,7 +1303,7 @@ pub(crate) fn parse_crate_name(
     let rustc_hir::Attribute::Parsed(AttributeKind::CrateName { name, name_span, .. }) =
         AttributeParser::parse_limited_should_emit(
             sess,
-            &attrs,
+            attrs,
             sym::crate_name,
             DUMMY_SP,
             rustc_ast::node_id::CRATE_NODE_ID,

compiler/rustc_interface/src/queries.rs

@@ -94,7 +94,7 @@ impl Linker {
                 &rlink_file,
                 &codegen_results,
                 &self.metadata,
-                &*self.output_filenames,
+                &self.output_filenames,
             )
             .unwrap_or_else(|error| {
                 sess.dcx().emit_fatal(FailedWritingFile { path: &rlink_file, error })

compiler/rustc_interface/src/util.rs

@@ -243,7 +243,7 @@ pub(crate) fn run_in_thread_pool_with_globals<
                                 let query_map = rustc_span::set_session_globals_then(unsafe { &*(session_globals as *const SessionGlobals) }, || {
                                     // Ensure there was no errors collecting all active jobs.
                                     // We need the complete map to ensure we find a cycle to break.
-                                    QueryCtxt::new(tcx).collect_active_jobs().ok().expect("failed to collect active queries in deadlock handler")
+                                    QueryCtxt::new(tcx).collect_active_jobs().expect("failed to collect active queries in deadlock handler")
                                 });
                                 break_query_cycles(query_map, &registry);
                             })
@@ -561,7 +561,7 @@ pub fn build_output_filenames(attrs: &[ast::Attribute], sess: &Session) -> Outpu
                 }
                 Some(out_file.clone())
             };
-            if sess.io.output_dir != None {
+            if sess.io.output_dir.is_some() {
                 sess.dcx().emit_warn(errors::IgnoringOutDir);
             }