Fix warnings in tests

Author: flip1995

Cargo.lock

@@ -652,14 +652,14 @@ mod test {
         expected = "This function should never be called with `parts == 0` or `parts > 3`"
     )]
     fn omitted_parts_with_zero() {
-        OmittedParts::from(0);
+        let _ = OmittedParts::from(0);
     }
 
     #[test]
     #[should_panic(
         expected = "This function should never be called with `parts == 0` or `parts > 3`"
     )]
     fn omitted_parts_with_four() {
-        OmittedParts::from(4);
+        let _ = OmittedParts::from(4);
     }
 }