Change unimplemented to unreachable

common/src/lib.rs

@@ -10,10 +10,13 @@ pub trait Solution {
     }
 }
 
+/// Load the input for the given year and day.
+/// Removes carriage returns and trims leading and trailing whitespace.
 pub fn load(year: u32, day: u32) -> String {
     load_raw(year, day).trim().replace('\r', "")
 }
 
+/// Load the input for the given year and day.
 pub fn load_raw(year: u32, day: u32) -> String {
     let file = format!("data/{year}/{:02}.txt", day);
     fs::read_to_string(&file).unwrap_or_else(|_| panic!("Error reading file {}", file))
@@ -23,15 +26,15 @@ pub struct DummySolution;
 
 impl Solution for DummySolution {
     fn name(&self) -> &'static str {
-        unimplemented!()
+        unreachable!()
     }
 
     fn part_a(&self) -> String {
-        unimplemented!()
+        unreachable!()
     }
 
     fn part_b(&self) -> String {
-        unimplemented!()
+        unreachable!()
     }
 
     fn is_dummy(&self) -> bool {