change edition to 2021, fix clippy warns

src/tools/rust-installer/Cargo.toml

@@ -2,7 +2,7 @@
 authors = ["The Rust Project Developers"]
 name = "installer"
 version = "0.0.0"
-edition = "2018"
+edition = "2021"
 
 [[bin]]
 doc = false

src/tools/rust-installer/src/combiner.rs

@@ -94,7 +94,7 @@ impl Combiner {
             let pkg_name =
                 input_tarball.trim_end_matches(&format!(".tar.{}", compression.extension()));
             let pkg_name = Path::new(pkg_name).file_name().unwrap();
-            let pkg_dir = Path::new(&self.work_dir).join(&pkg_name);
+            let pkg_dir = Path::new(&self.work_dir).join(pkg_name);
 
             // Verify the version number.
             let mut version = String::new();
@@ -114,9 +114,9 @@ impl Combiner {
                 // All we need to do is copy the component directory. We could
                 // move it, but rustbuild wants to reuse the unpacked package
                 // dir for OS-specific installers on macOS and Windows.
-                let component_dir = package_dir.join(&component);
+                let component_dir = package_dir.join(component);
                 create_dir(&component_dir)?;
-                copy_recursive(&pkg_dir.join(&component), &component_dir)?;
+                copy_recursive(&pkg_dir.join(component), &component_dir)?;
 
                 // Merge the component name.
                 writeln!(&components, "{}", component).context("failed to write new components")?;
@@ -158,7 +158,7 @@ impl Combiner {
             .input(self.package_name)
             .output(path_to_str(&output)?.into())
             .compression_profile(self.compression_profile)
-            .compression_formats(self.compression_formats.clone());
+            .compression_formats(self.compression_formats);
         tarballer.run()?;
 
         Ok(())

src/tools/rust-installer/src/compression.rs

@@ -166,7 +166,7 @@ impl Default for CompressionFormats {
 
 impl CompressionFormats {
     pub(crate) fn iter(&self) -> impl Iterator<Item = CompressionFormat> + '_ {
-        self.0.iter().map(|i| *i)
+        self.0.iter().copied()
     }
 }
 

src/tools/rust-installer/src/generator.rs

@@ -118,7 +118,7 @@ impl Generator {
             .input(self.package_name)
             .output(path_to_str(&output)?.into())
             .compression_profile(self.compression_profile)
-            .compression_formats(self.compression_formats.clone());
+            .compression_formats(self.compression_formats);
         tarballer.run()?;
 
         Ok(())

src/tools/rust-installer/src/scripter.rs

@@ -2,7 +2,7 @@ use crate::util::*;
 use anyhow::{Context, Result};
 use std::io::Write;
 
-const TEMPLATE: &'static str = include_str!("../install-template.sh");
+const TEMPLATE: &str = include_str!("../install-template.sh");
 
 actor! {
     #[derive(Debug)]

src/tools/rust-installer/src/tarballer.rs

@@ -98,7 +98,7 @@ fn append_path<W: Write>(builder: &mut Builder<W>, src: &Path, path: &String) ->
         if cfg!(windows) {
             // Windows doesn't really have a mode, so `tar` never marks files executable.
             // Use an extension whitelist to update files that usually should be so.
-            const EXECUTABLES: [&'static str; 4] = ["exe", "dll", "py", "sh"];
+            const EXECUTABLES: [&str; 4] = ["exe", "dll", "py", "sh"];
             if let Some(ext) = src.extension().and_then(|s| s.to_str()) {
                 if EXECUTABLES.contains(&ext) {
                     let mode = header.mode()?;
@@ -134,7 +134,7 @@ where
     for entry in WalkDir::new(root.join(name)) {
         let entry = entry?;
         let path = entry.path().strip_prefix(root)?;
-        let path = path_to_str(&path)?;
+        let path = path_to_str(path)?;
 
         if entry.file_type().is_dir() {
             dirs.push(path.to_owned());

src/tools/rust-installer/src/util.rs

@@ -117,7 +117,7 @@ where
         } else {
             copy(entry.path(), dst)?;
         }
-        callback(&path, file_type)?;
+        callback(path, file_type)?;
     }
     Ok(())
 }