Fix building without compare feature.

src/main.rs

@@ -37,10 +37,14 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
 #[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
 fn main_body() -> Result<(), Box<dyn std::error::Error>> {
+    #[cfg(not(feature = "compare"))]
+    let org_contents = "";
+    #[cfg(feature = "compare")]
     let org_contents = read_stdin_to_string()?;
     run_compare(org_contents)
 }
 
+#[cfg(feature = "compare")]
 fn read_stdin_to_string() -> Result<String, Box<dyn std::error::Error>> {
     let mut stdin_contents = String::new();
     std::io::stdin()
@@ -75,7 +79,7 @@ fn run_compare<P: AsRef<str>>(org_contents: P) -> Result<(), Box<dyn std::error:
 }
 
 #[cfg(not(feature = "compare"))]
-fn run_compare<P: AsRef<Path>>(_todo_org_path: P) -> Result<(), Box<dyn std::error::Error>> {
+fn run_compare<P: AsRef<str>>(_org_contents: P) -> Result<(), Box<dyn std::error::Error>> {
     println!("This program was built with compare disabled. Doing nothing.");
     Ok(())
 }