How about separate the processing code from error handling code into a block of it's own. Like this: fn file_double<P: AsRef<Path>>(file_path: P) -> Re

How about separate the processing code from error handling code into a block of it's own. Like this: fn file_double<P: AsRef<Path>>(file_path: P) -> Result<i32, String> { let mut file = File::open(file_path); let mut contents = String::new(); let read_Result = file.read_to_string(&mut contents); let n = contents.trim.parse::<i32>(); let result = 2 * n; error_handling { file: None => Err("Failed open file"), read_Result: Err(err) => Err(err), n: Err(err) => Err(err), _success: Ok(result) }; } The compiler would then convert each error handling case into early return statements in the places where assignment is made to the specified variable.