return early from de_position with ?

src/structs.rs

@@ -99,7 +99,7 @@ mod helpers {
   /// The input string here is either a number or two numbers separated by `SEPARATOR`.
   pub fn de_position<'de, D>(deserializer: D) -> Result<Option<Position>, D::Error>
   where D: de::Deserializer<'de> {
-    if let Ok(s) = String::deserialize(deserializer) {
+    let s = String::deserialize(deserializer)?;
     let mut ints = s.split(SEPARATOR).map(u16::from_str);
     if let Some(Ok(n)) = ints.next() {
       return Ok(Some(Position {
@@ -107,7 +107,6 @@ mod helpers {
         total_items:   ints.next().and_then(Result::ok),
       }));
     }
-    }
     Ok(None)
   }
 }