fixes for numerous clippy warnings

2 files changed, 11 insertions, 12 deletions

diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs
index 4f875cf99ec..8dab520cf36 100644
--- a/compiler/rustc_driver_impl/src/lib.rs
+++ b/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) {
diff --git a/compiler/rustc_driver_impl/src/print.rs b/compiler/rustc_driver_impl/src/print.rs
index 70de55320f7..3f107eb7a61 100644
--- a/compiler/rustc_driver_impl/src/print.rs
+++ b/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();
     }
 }