minor improvement

Signed-off-by: Konstantin Läufer <[email protected]>

src/bin/day1.rs

@@ -10,7 +10,7 @@ fn main() -> io::Result<()> {
 
 fn run_calibration(label: &str, file_name: &str, digits: &[String]) -> io::Result<()> {
     let file = File::open("data/".to_string() + file_name)?;
-    let lines = BufReader::new(file).lines().map(Result::unwrap).collect::<Vec<_>>();
+    let lines = BufReader::new(file).lines().collect::<io::Result<Vec<String>>>()?;
     println!("Day 1 {} solution: {}", label, calibrate_lines(&lines, digits));
     Ok(())
 }
@@ -48,7 +48,7 @@ fn calibrate_line(line: &str, digits: &[String]) -> Option<usize> {
 }
 
 static SIMPLE_DIGITS: Lazy<Vec<String>> = Lazy::new(|| {
-    (0 .. 10).map(|d| d.to_string()).collect::<Vec<_>>() 
+    (0 .. 10).map(|d| d.to_string()).collect() 
 });
 
 static WORD_DIGITS: Lazy<Vec<String>> = Lazy::new(|| { 

src/bin/day5.rs

@@ -1,16 +1,15 @@
 use std::{
     fs::File,
-    io::{BufRead, BufReader},
+    io::{self, BufRead, BufReader},
 };
 
 use log::info;
-use anyhow::Result; // simplified error handling
 use once_cell::sync::Lazy; // global constants
 use regex::Regex;
 
 static NUMBER: Lazy<Regex> = Lazy::new(|| Regex::new(r"(\d+)").unwrap());
 
-fn main() -> Result<()> {
+fn main() -> io::Result<()> {
     env_logger::init();
     let file = File::open("data/day5input.txt")?;
     let mut lines = BufReader::new(file)