diff --git a/examples/cargo_manifest_dir/external_crate/src/lib.rs b/examples/cargo_manifest_dir/external_crate/src/lib.rs
index b462aebe04..d453fdd93a 100644
--- a/examples/cargo_manifest_dir/external_crate/src/lib.rs
+++ b/examples/cargo_manifest_dir/external_crate/src/lib.rs
@@ -1,4 +1,6 @@
-
 pub fn get_included_str() -> &'static str {
-    include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/include/included_file.rs.inc"))
+    include_str!(concat!(
+        env!("CARGO_MANIFEST_DIR"),
+        "/include/included_file.rs.inc"
+    ))
 }
diff --git a/examples/crate_universe/uses_proc_macro/src/main.rs b/examples/crate_universe/uses_proc_macro/src/main.rs
index 90ab63cd60..cb74314db4 100644
--- a/examples/crate_universe/uses_proc_macro/src/main.rs
+++ b/examples/crate_universe/uses_proc_macro/src/main.rs
@@ -3,7 +3,7 @@ use structopt::StructOpt;
 #[derive(StructOpt)]
 struct Opt {
     #[structopt(long)]
-    name: String
+    name: String,
 }
 
 fn main() {
diff --git a/examples/fibonacci/benches/fibonacci_bench.rs b/examples/fibonacci/benches/fibonacci_bench.rs
index 80aa1a84ce..4a8b721d1d 100644
--- a/examples/fibonacci/benches/fibonacci_bench.rs
+++ b/examples/fibonacci/benches/fibonacci_bench.rs
@@ -14,8 +14,8 @@
 
 #![feature(test)]
 
-extern crate test;
 extern crate fibonacci;
+extern crate test;
 
 use test::Bencher;
 
diff --git a/examples/per_platform_printer/print_windows.rs b/examples/per_platform_printer/print_windows.rs
index 2dcd0c693e..b857dcb3e9 100644
--- a/examples/per_platform_printer/print_windows.rs
+++ b/examples/per_platform_printer/print_windows.rs
@@ -1,3 +1,3 @@
 pub fn print() -> String {
-  "Hello Windows!".to_owned()
+    "Hello Windows!".to_owned()
 }
diff --git a/test/build_env/src/build.rs b/test/build_env/src/build.rs
index 642b1d6f6a..654572a2be 100644
--- a/test/build_env/src/build.rs
+++ b/test/build_env/src/build.rs
@@ -1,5 +1,11 @@
 fn main() {
-    println!("cargo:rustc-env=CARGO_PKG_NAME_FROM_BUILD_SCRIPT={}", env!("CARGO_PKG_NAME"));
-    println!("cargo:rustc-env=CARGO_CRATE_NAME_FROM_BUILD_SCRIPT={}", env!("CARGO_CRATE_NAME"));
+    println!(
+        "cargo:rustc-env=CARGO_PKG_NAME_FROM_BUILD_SCRIPT={}",
+        env!("CARGO_PKG_NAME")
+    );
+    println!(
+        "cargo:rustc-env=CARGO_CRATE_NAME_FROM_BUILD_SCRIPT={}",
+        env!("CARGO_CRATE_NAME")
+    );
     println!("cargo:rustc-env=HAS_TRAILING_SLASH=foo\\");
 }
diff --git a/test/build_env/tests/cargo.rs b/test/build_env/tests/cargo.rs
index 6caca65cce..2c9d244c2a 100644
--- a/test/build_env/tests/cargo.rs
+++ b/test/build_env/tests/cargo.rs
@@ -2,7 +2,13 @@
 fn cargo_env_vars() {
     assert_eq!(env!("CARGO_PKG_NAME"), "cargo_env-vars_test");
     assert_eq!(env!("CARGO_CRATE_NAME"), "cargo_env_vars_test");
-    assert_eq!(env!("CARGO_PKG_NAME_FROM_BUILD_SCRIPT"), "cargo_build_script_env-vars");
-    assert_eq!(env!("CARGO_CRATE_NAME_FROM_BUILD_SCRIPT"), "cargo_build_script_env_vars");
+    assert_eq!(
+        env!("CARGO_PKG_NAME_FROM_BUILD_SCRIPT"),
+        "cargo_build_script_env-vars"
+    );
+    assert_eq!(
+        env!("CARGO_CRATE_NAME_FROM_BUILD_SCRIPT"),
+        "cargo_build_script_env_vars"
+    );
     assert_eq!(env!("HAS_TRAILING_SLASH"), "foo\\");
 }
diff --git a/test/build_env/tests/custom_crate_name.rs b/test/build_env/tests/custom_crate_name.rs
index 2700af4730..e80bd89983 100644
--- a/test/build_env/tests/custom_crate_name.rs
+++ b/test/build_env/tests/custom_crate_name.rs
@@ -1,5 +1,8 @@
 #[test]
 fn cargo_env_vars() {
-    assert_eq!(env!("CARGO_PKG_NAME"), "cargo-env-vars-custom-crate-name-test");
+    assert_eq!(
+        env!("CARGO_PKG_NAME"),
+        "cargo-env-vars-custom-crate-name-test"
+    );
     assert_eq!(env!("CARGO_CRATE_NAME"), "custom_crate_name");
 }
diff --git a/test/build_env/tests/manifest_dir.rs b/test/build_env/tests/manifest_dir.rs
index bf80013bd6..422a16c4f5 100644
--- a/test/build_env/tests/manifest_dir.rs
+++ b/test/build_env/tests/manifest_dir.rs
@@ -1,6 +1,9 @@
 #[test]
 pub fn test_manifest_dir() {
-    let actual = include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/src/manifest_dir_file.txt"));
+    let actual = include_str!(concat!(
+        env!("CARGO_MANIFEST_DIR"),
+        "/src/manifest_dir_file.txt"
+    ));
     let expected = "This file tests that CARGO_MANIFEST_DIR is set for the build environment\n";
     assert_eq!(actual, expected);
 }
diff --git a/test/inline_test_with_deps/test_with_srcs/src/lib.rs b/test/inline_test_with_deps/test_with_srcs/src/lib.rs
index 526613b39c..da59d95e48 100644
--- a/test/inline_test_with_deps/test_with_srcs/src/lib.rs
+++ b/test/inline_test_with_deps/test_with_srcs/src/lib.rs
@@ -8,7 +8,7 @@ mod extra;
 
 #[cfg(test)]
 mod tests {
-    use super::{multiply, extra};
+    use super::{extra, multiply};
     use dep::example_test_dep_fn;
 
     #[test]
diff --git a/test/test_env/tests/run.rs b/test/test_env/tests/run.rs
index 4353b728bd..1abaa7ab09 100644
--- a/test/test_env/tests/run.rs
+++ b/test/test_env/tests/run.rs
@@ -1,23 +1,30 @@
 #[test]
 fn run() {
     let path = env!("CARGO_BIN_EXE_hello-world");
-    let output = std::process::Command::new(path).output().expect("Failed to run process");
+    let output = std::process::Command::new(path)
+        .output()
+        .expect("Failed to run process");
     assert_eq!(&b"Hello world\n"[..], output.stdout.as_slice());
 
     // Test the `env` attribute of `rust_test` at run time
-    assert_eq!(std::env::var("FERRIS_SAYS").unwrap(), "Hello fellow Rustaceans!");
+    assert_eq!(
+        std::env::var("FERRIS_SAYS").unwrap(),
+        "Hello fellow Rustaceans!"
+    );
 
     // Test the behavior of `rootpath` and that a binary can be found relative to current_dir
-    let hello_world_bin = std::path::PathBuf::from(std::env::var_os("HELLO_WORLD_BIN_ROOTPATH").unwrap());
+    let hello_world_bin =
+        std::path::PathBuf::from(std::env::var_os("HELLO_WORLD_BIN_ROOTPATH").unwrap());
     assert_eq!(
-        hello_world_bin.as_path(), 
+        hello_world_bin.as_path(),
         std::path::Path::new("test/test_env/hello-world"),
     );
     assert!(!hello_world_bin.is_absolute());
     assert!(hello_world_bin.exists());
 
     // Ensure `execpath` expanded variables map to real files and have absolute paths
-    let hello_world_src = std::path::PathBuf::from(std::env::var("HELLO_WORLD_SRC_EXECPATH").unwrap());
+    let hello_world_src =
+        std::path::PathBuf::from(std::env::var("HELLO_WORLD_SRC_EXECPATH").unwrap());
     assert!(hello_world_src.is_absolute());
     assert!(hello_world_src.exists());
 }
diff --git a/test/transitive_lib/build.rs b/test/transitive_lib/build.rs
index c3e700116c..90b5a12c8f 100644
--- a/test/transitive_lib/build.rs
+++ b/test/transitive_lib/build.rs
@@ -1,3 +1,3 @@
 fn main() {
-   println!("cargo:rustc-link-lib=alias:shell32");
+    println!("cargo:rustc-link-lib=alias:shell32");
 }
diff --git a/test/unit/cc_info/bin_using_native_dep.rs b/test/unit/cc_info/bin_using_native_dep.rs
index 6250ab356b..b128c4f19f 100644
--- a/test/unit/cc_info/bin_using_native_dep.rs
+++ b/test/unit/cc_info/bin_using_native_dep.rs
@@ -3,4 +3,4 @@ extern "C" {
 }
 fn main() {
     println!("{}", unsafe { native_dep() })
-}
\ No newline at end of file
+}
diff --git a/test/unit/cc_info/foo.rs b/test/unit/cc_info/foo.rs
index 9bda8eef2c..20e63e3c2f 100644
--- a/test/unit/cc_info/foo.rs
+++ b/test/unit/cc_info/foo.rs
@@ -1 +1,3 @@
-pub fn main() { dbg!(42); }
\ No newline at end of file
+pub fn main() {
+    dbg!(42);
+}
diff --git a/test/unit/cc_info/proc_macro.rs b/test/unit/cc_info/proc_macro.rs
index 0ab4b9e55c..6a745c6062 100644
--- a/test/unit/cc_info/proc_macro.rs
+++ b/test/unit/cc_info/proc_macro.rs
@@ -6,4 +6,4 @@ extern "C" {
 #[proc_macro_derive(UsingNativeDep)]
 pub fn use_native_dep(_input: TokenStream) -> TokenStream {
     panic!("done")
-}
\ No newline at end of file
+}
diff --git a/test/unit/crate_name/lib.rs b/test/unit/crate_name/lib.rs
index e69de29bb2..8b13789179 100644
--- a/test/unit/crate_name/lib.rs
+++ b/test/unit/crate_name/lib.rs
@@ -0,0 +1 @@
+
diff --git a/test/unit/interleaved_cc_info/a.rs b/test/unit/interleaved_cc_info/a.rs
index e69de29bb2..8b13789179 100644
--- a/test/unit/interleaved_cc_info/a.rs
+++ b/test/unit/interleaved_cc_info/a.rs
@@ -0,0 +1 @@
+
diff --git a/test/unit/interleaved_cc_info/c.rs b/test/unit/interleaved_cc_info/c.rs
index e69de29bb2..8b13789179 100644
--- a/test/unit/interleaved_cc_info/c.rs
+++ b/test/unit/interleaved_cc_info/c.rs
@@ -0,0 +1 @@
+
diff --git a/test/unit/interleaved_cc_info/e.rs b/test/unit/interleaved_cc_info/e.rs
index e69de29bb2..8b13789179 100644
--- a/test/unit/interleaved_cc_info/e.rs
+++ b/test/unit/interleaved_cc_info/e.rs
@@ -0,0 +1 @@
+
diff --git a/test/unit/native_deps/bin_using_native_dep.rs b/test/unit/native_deps/bin_using_native_dep.rs
index 6250ab356b..b128c4f19f 100644
--- a/test/unit/native_deps/bin_using_native_dep.rs
+++ b/test/unit/native_deps/bin_using_native_dep.rs
@@ -3,4 +3,4 @@ extern "C" {
 }
 fn main() {
     println!("{}", unsafe { native_dep() })
-}
\ No newline at end of file
+}
diff --git a/test/unit/native_deps/lib_using_native_dep.rs b/test/unit/native_deps/lib_using_native_dep.rs
index 1c0a8bcdb0..0e8ddae095 100644
--- a/test/unit/native_deps/lib_using_native_dep.rs
+++ b/test/unit/native_deps/lib_using_native_dep.rs
@@ -3,4 +3,4 @@ extern "C" {
 }
 pub fn use_native_dep() {
     println!("{}", unsafe { native_dep() })
-}
\ No newline at end of file
+}
diff --git a/test/unit/native_deps/proc_macro_using_native_dep.rs b/test/unit/native_deps/proc_macro_using_native_dep.rs
index edbce61f3e..6dcfc228ae 100644
--- a/test/unit/native_deps/proc_macro_using_native_dep.rs
+++ b/test/unit/native_deps/proc_macro_using_native_dep.rs
@@ -7,4 +7,4 @@ extern "C" {
 pub fn use_native_dep(_input: TokenStream) -> TokenStream {
     println!("{}", unsafe { native_dep() });
     panic!("done")
-}
\ No newline at end of file
+}
diff --git a/test/versioned_dylib/src/main.rs b/test/versioned_dylib/src/main.rs
index bff8eda6b8..ee94707219 100644
--- a/test/versioned_dylib/src/main.rs
+++ b/test/versioned_dylib/src/main.rs
@@ -14,7 +14,7 @@
 
 extern crate libc;
 
-extern {
+extern "C" {
     pub fn return_zero() -> libc::c_int;
 }
 
@@ -23,10 +23,9 @@ fn main() {
     println!("Got {} from our shared lib", zero);
 }
 
-
 #[cfg(test)]
 mod test {
-    extern {
+    extern "C" {
         pub fn return_zero() -> libc::c_int;
     }
 
diff --git a/util/label/label.rs b/util/label/label.rs
index bd11a6e404..6b441c58c8 100644
--- a/util/label/label.rs
+++ b/util/label/label.rs
@@ -255,7 +255,8 @@ mod tests {
         assert_eq!(
             analyze("foo//bar"),
             Err(LabelError(
-                "foo//bar must be a legal label; '//' cannot appear in the middle of the label.".to_string()
+                "foo//bar must be a legal label; '//' cannot appear in the middle of the label."
+                    .to_string()
             ))
         );
         assert_eq!(
diff --git a/util/label/label_error.rs b/util/label/label_error.rs
index a09d0e8237..b1d71996fd 100644
--- a/util/label/label_error.rs
+++ b/util/label/label_error.rs
@@ -3,7 +3,7 @@ pub struct LabelError(pub String);
 
 impl std::fmt::Display for LabelError {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        write!(f,"{}",self.0)
+        write!(f, "{}", self.0)
     }
 }
 
diff --git a/util/launcher/launcher_main.rs b/util/launcher/launcher_main.rs
index 0fe27a47f1..10a2a09ff8 100644
--- a/util/launcher/launcher_main.rs
+++ b/util/launcher/launcher_main.rs
@@ -1,6 +1,6 @@
 use std::collections::BTreeMap;
 use std::fs::File;
-use std::io::{BufReader, BufRead};
+use std::io::{BufRead, BufReader};
 use std::path::PathBuf;
 use std::process::Command;
 use std::vec::Vec;
@@ -11,7 +11,7 @@ use std::os::unix::process::CommandExt;
 /// This string must match the one found in `_create_test_launcher`
 const LAUNCHFILES_ENV_PATH: &'static str = ".launchfiles/env";
 
-/// Load environment variables from a uniquly formatted 
+/// Load environment variables from a uniquly formatted
 fn environ() -> BTreeMap<String, String> {
     let mut environ = BTreeMap::new();
 
@@ -21,7 +21,7 @@ fn environ() -> BTreeMap<String, String> {
     let env_path = std::env::args().nth(0).expect("arg 0 was not set") + LAUNCHFILES_ENV_PATH;
     let file = File::open(env_path).expect("Failed to load the environment file");
 
-    // Variables will have the `${pwd}` variable replaced which is rendered by 
+    // Variables will have the `${pwd}` variable replaced which is rendered by
     // `@rules_rust//rust/private:util.bzl::expand_locations`
     let pwd = std::env::current_dir().expect("Failed to get current working directory");
     let pwd_str = pwd.to_string_lossy();
@@ -35,25 +35,28 @@ fn environ() -> BTreeMap<String, String> {
 
         environ.insert(
             key.expect("Key is not set"),
-            line.expect("Failed to read line").replace("${pwd}", &pwd_str),
+            line.expect("Failed to read line")
+                .replace("${pwd}", &pwd_str),
         );
 
         key = None;
     }
-    
+
     environ
 }
 
 /// Locate the executable based on the name of the launcher executable
 fn executable() -> PathBuf {
     let mut exec_path = std::env::args().nth(0).expect("arg 0 was not set");
-    let stem_index = exec_path.rfind(".launcher").expect("This executable should always contain `.launcher`");
+    let stem_index = exec_path
+        .rfind(".launcher")
+        .expect("This executable should always contain `.launcher`");
 
     // Remove the substring from the exec path
     for _char in ".launcher".chars() {
         exec_path.remove(stem_index);
     }
-    
+
     PathBuf::from(exec_path)
 }
 
@@ -67,9 +70,9 @@ fn args() -> Vec<String> {
 #[cfg(target_family = "unix")]
 fn exec(environ: BTreeMap<String, String>, executable: PathBuf, args: Vec<String>) {
     let error = Command::new(&executable)
-    .envs(environ.iter())
-    .args(args)
-    .exec();
+        .envs(environ.iter())
+        .args(args)
+        .exec();
 
     panic!("Process failed to start: {:?} with {:?}", executable, error)
 }
@@ -79,10 +82,10 @@ fn exec(environ: BTreeMap<String, String>, executable: PathBuf, args: Vec<String
 #[cfg(target_family = "windows")]
 fn exec(environ: BTreeMap<String, String>, executable: PathBuf, args: Vec<String>) {
     let output = Command::new(executable)
-    .envs(environ.iter())
-    .args(args)
-    .output()
-    .expect("Failed to run process");
+        .envs(environ.iter())
+        .args(args)
+        .output()
+        .expect("Failed to run process");
 
     std::process::exit(output.status.code().unwrap_or(1));
 }