cargo clippy fixes

Author: Firestar99

crates/cargo-gpu-install/src/install_toolchain.rs

@@ -148,7 +148,7 @@ pub fn run_cmd(cmd: &mut Command) -> anyhow::Result<(String, String)> {
         anyhow::bail!(
             "Command `{}` failed with {}:\n-- stdout\n{stdout}\n-- stderr\n{stderr}",
             fmt_cmd(),
-            &output.status,
+            output.status,
         );
     }
     Ok((stdout, stderr))

crates/cargo-gpu-install/src/spirv_source.rs

@@ -162,7 +162,7 @@ impl SpirvSource {
                         Some(Self::Git { url, rev })
                     };
                     parse_git()
-                        .with_context(|| format!("Failed to parse git url {}", &source.repr))?
+                        .with_context(|| format!("Failed to parse git url {}", source.repr))?
                 }
                 (false, true) => Self::CratesIO(spirv_std_package.version.clone()),
                 (false, false) => {

crates/rustc_codegen_spirv/src/linker/destructure_composites.rs

@@ -57,7 +57,7 @@ pub fn destructure_composites(function: &mut Function) {
 
     // Transitive closure computation
     let mut closed_rewrite_rules = rewrite_rules.clone();
-    for (_, value) in closed_rewrite_rules.iter_mut() {
+    for value in closed_rewrite_rules.values_mut() {
         while let Some(next) = rewrite_rules.get(value) {
             *value = *next;
         }