fixed errors

src/check/testables.rs

@@ -1,5 +1,3 @@
-use crate::utils::log_failure;
-
 fn ends_with_newline(source: String) -> Result<(), String> {
 	if !source.ends_with('\n') {
 		Err("source does not end with newline".into())
@@ -14,10 +12,7 @@ pub struct Rule {
 }
 
 impl Rule {
-	pub fn new<'a>(
-		name: impl ToString,
-		test: impl 'static + Fn(String) -> Result<(), String>,
-	) -> Self {
+	pub fn new(name: impl ToString, test: impl 'static + Fn(String) -> Result<(), String>) -> Self {
 		let name = name.to_string();
 		let test = Box::new(test);
 		Self { name, test }

src/tasks.rs

@@ -161,6 +161,7 @@ impl CmdTask {
 		Self { command }
 	}
 
+	#[allow(clippy::result_unit_err)]
 	pub fn run(self) -> Result<(), ()> {
 		Command::new("sh")
 			.arg("-c")