Address newest clippy warnings

build.rs

@@ -1,3 +1,4 @@
+
 fn main() {
 	// Check that a single TLS feature has been used
 	#[cfg(all(feature = "rustls-tls", feature = "native-tls"))]
@@ -14,6 +15,7 @@ fn main() {
 }
 
 mod shell_completions {
+	#![allow(dead_code)]  // Ignore unused warnings caused by including cli_args below.
 	extern crate structopt;
 
 	use structopt::clap::Shell;

src/rua_paths.rs

@@ -205,6 +205,7 @@ fn ensure_script(path: &Path, content: &[u8]) {
 	if !path.exists() {
 		let mut file = OpenOptions::new()
 			.create(true)
+			.truncate(true)
 			.write(true)
 			.open(path)
 			.unwrap_or_else(|e| panic!("Failed to overwrite (initialize) file {:?}, {}", path, e));

src/wrapped.rs

@@ -188,7 +188,7 @@ pub fn shellcheck(target: &Option<PathBuf>) -> Result<(), String> {
 	let stdin: &mut std::process::ChildStdin = child
 		.stdin
 		.as_mut()
-		.map_or(Err("Failed to open stdin for shellcheck"), Ok)?;
+		.ok_or("Failed to open stdin for shellcheck")?;
 	let bytes = rua_paths::SHELLCHECK_WRAPPER.replace("%PKGBUILD%", &target_contents);
 	stdin.write_all(bytes.as_bytes()).map_err(|err| {
 		format!(