Resolve some clippy lint warnings

src/cargo/core/compiler/mod.rs

@@ -1010,8 +1010,8 @@ fn json_stderr(line: &str, package_id: &PackageId, target: &Target) -> CargoResu
             .map_err(|_| internal(&format!("compiler produced invalid json: `{}`", line)))?;
 
         machine_message::emit(&machine_message::FromCompiler {
-            package_id: package_id,
-            target: target,
+            package_id,
+            target,
             message: compiler_message,
         });
     } else {

src/cargo/ops/fix.rs

@@ -328,7 +328,7 @@ fn rustfix_and_fix(fixes: &mut FixedCrate, rustc: &Path, filename: &Path, args:
             filename,
             output.status.code()
         );
-        return Ok(Default::default());
+        return Ok(());
     }
 
     let fix_mode = env::var_os("__CARGO_FIX_YOLO")

src/cargo/util/lev_distance.rs

@@ -38,7 +38,7 @@ fn test_lev_distance() {
     use std::char::{from_u32, MAX};
     // Test bytelength agnosticity
     for c in (0u32..MAX as u32)
-        .filter_map(|i| from_u32(i))
+        .filter_map(from_u32)
         .map(|i| i.to_string())
     {
         assert_eq!(lev_distance(&c, &c), 0);

tests/testsuite/build_script.rs

@@ -1,7 +1,6 @@
 use std::env;
 use std::fs::{self, File};
 use std::io::prelude::*;
-use std::path::PathBuf;
 use std::io;
 use std::thread;
 use std::time::Duration;
@@ -3555,8 +3554,7 @@ fn rename_with_link_search_path() {
     // the `p` project. On OSX the `libfoo.dylib` artifact references the
     // original path in `p` so we want to make sure that it can't find it (hence
     // the deletion).
-    let root = PathBuf::from(p.root());
-    let root = root.join("target").join("debug").join("deps");
+    let root = p.root().join("target").join("debug").join("deps");
     let file = format!("{}foo{}", env::consts::DLL_PREFIX, env::consts::DLL_SUFFIX);
     let src = root.join(&file);
 

tests/testsuite/config.rs

@@ -651,10 +651,10 @@ i64max = 9223372036854775807
         ("CARGO_EI64MAX", "9223372036854775807"),
     ]);
 
-    assert_eq!(config.get::<u64>("i64max").unwrap(), 9223372036854775807);
-    assert_eq!(config.get::<i64>("i64max").unwrap(), 9223372036854775807);
-    assert_eq!(config.get::<u64>("ei64max").unwrap(), 9223372036854775807);
-    assert_eq!(config.get::<i64>("ei64max").unwrap(), 9223372036854775807);
+    assert_eq!(config.get::<u64>("i64max").unwrap(), 9_223_372_036_854_775_807);
+    assert_eq!(config.get::<i64>("i64max").unwrap(), 9_223_372_036_854_775_807);
+    assert_eq!(config.get::<u64>("ei64max").unwrap(), 9_223_372_036_854_775_807);
+    assert_eq!(config.get::<i64>("ei64max").unwrap(), 9_223_372_036_854_775_807);
 
     assert_error(
         config.get::<u32>("nneg").unwrap_err(),

tests/testsuite/doc.rs

@@ -1359,7 +1359,7 @@ fn doc_private_items() {
     assert_that(&foo.root().join("target/doc/foo/private/index.html"), existing_file());
 }
 
-const BAD_INTRA_LINK_LIB: &'static str = r#"
+const BAD_INTRA_LINK_LIB: &str = r#"
 #![deny(intra_doc_link_resolution_failure)]
 
 /// [bad_link]

tests/testsuite/git.rs

@@ -218,24 +218,22 @@ fn cargo_compile_offline_with_cached_git_dep() {
         execs().with_stdout("hello from cached git repo rev2\n"),
     );
 
-    drop(
-        File::create(&p.root().join("Cargo.toml"))
-            .unwrap()
-            .write_all(&format!(
-                r#"
-            [project]
-            name = "foo"
-            version = "0.5.0"
+    File::create(&p.root().join("Cargo.toml"))
+        .unwrap()
+        .write_all(&format!(
+            r#"
+        [project]
+        name = "foo"
+        version = "0.5.0"
 
-            [dependencies.dep1]
-            git = '{}'
-            rev = "{}"
+        [dependencies.dep1]
+        git = '{}'
+        rev = "{}"
     "#,
-                git_project.url(),
-                rev1
-            ).as_bytes())
-            .unwrap(),
-    );
+            git_project.url(),
+            rev1
+        ).as_bytes())
+        .unwrap();
 
     let _out = p
         .cargo("build")

tests/testsuite/support/git.rs

@@ -137,9 +137,8 @@ pub fn commit(repo: &git2::Repository) -> git2::Oid {
     let tree_id = t!(t!(repo.index()).write_tree());
     let sig = t!(repo.signature());
     let mut parents = Vec::new();
-    match repo.head().ok().map(|h| h.target().unwrap()) {
-        Some(parent) => parents.push(t!(repo.find_commit(parent))),
-        None => {}
+    if let Some(parent) = repo.head().ok().map(|h| h.target().unwrap()) {
+        parents.push(t!(repo.find_commit(parent)))
     }
     let parents = parents.iter().collect::<Vec<_>>();
     t!(repo.commit(

tests/testsuite/support/mod.rs

@@ -261,12 +261,7 @@ impl ProjectBuilder {
             symlink.mk();
         }
 
-        let ProjectBuilder {
-            root,
-            files: _,
-            symlinks: _,
-            ..
-        } = self;
+        let ProjectBuilder { root, .. } = self;
         root
     }