tracks/rust/exercises/perfect-numbers/src/lib.rs in trackler-2.2.1.110 vs tracks/rust/exercises/perfect-numbers/src/lib.rs in trackler-2.2.1.111

@@ -3,8 +3,8 @@
     Abundant,
     Perfect,
     Deficient
 }
 
-pub fn classify(num: u64) -> Result<Classification, & 'static str> {
+pub fn classify(num: u64) -> Option<Classification> {
     unimplemented!();
 }