tidy: Extract let mut part out of parts block in version.rs

Author: rasendubi

src/tools/tidy/src/features/version.rs

@@ -31,15 +31,13 @@ impl FromStr for Version {
     fn from_str(s: &str) -> Result<Self, Self::Err> {
         let mut iter = s.split('.').map(|part| Ok(part.parse()?));
 
-        let parts = {
-            let mut part = || {
-                iter.next()
-                    .unwrap_or(Err(ParseVersionError::WrongNumberOfParts))
-            };
-
-            [part()?, part()?, part()?]
+        let mut part = || {
+            iter.next()
+                .unwrap_or(Err(ParseVersionError::WrongNumberOfParts))
         };
 
+        let parts = [part()?, part()?, part()?];
+
         if let Some(_) = iter.next() {
             // Ensure we don't have more than 3 parts.
             return Err(ParseVersionError::WrongNumberOfParts);