more expressive first iteration

Author: jonboh

clippy_lints/src/item_name_repetitions.rs

@@ -209,14 +209,16 @@ fn check_fields(cx: &LateContext<'_>, threshold: u64, fields: &[FieldDef<'_>], i
         }
     }
 
-    let first_field = match fields.get(0) {
-        Some(field) => field.ident.name.as_str(),
+    let mut pre = match fields.get(0) {
+        Some(first_field) => {
+            let words: Vec<&str> = first_field.ident.name.as_str().split('_').collect();
+            if words.len() == 1 {
+                return;
+            }
+            words
+        },
         None => return,
     };
-    let mut pre: Vec<&str> = first_field.split('_').collect();
-    if pre.len() == 1 {
-        return;
-    }
     let mut post = pre.clone();
     post.reverse();
     for field in fields.iter().skip(1) {