function definition style simplification

clippy_lints/src/array_indexing.rs

@@ -107,8 +107,12 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ArrayIndexing {
 }
 
 /// Returns an option containing a tuple with the start and end (exclusive) of the range.
-fn to_const_range(start: Option<Option<ConstVal>>, end: Option<Option<ConstVal>>, limits: RangeLimits, array_size: ConstInt)
-    -> Option<(ConstInt, ConstInt)> {
+fn to_const_range(
+    start: Option<Option<ConstVal>>,
+    end: Option<Option<ConstVal>>,
+    limits: RangeLimits,
+    array_size: ConstInt
+) -> Option<(ConstInt, ConstInt)> {
     let start = match start {
         Some(Some(ConstVal::Integral(x))) => x,
         Some(_) => return None,