clang format

Author: huixie90

libcxx/test/std/containers/container.adaptors/flat_helpers.h

@@ -29,9 +29,7 @@ template <class T>
 struct SillyReserveVector : std::vector<T> {
   using std::vector<T>::vector;
 
-  void reserve(size_t ) {
-    this->clear();
-  }
+  void reserve(size_t) { this->clear(); }
 };
 
 template <class T, bool ConvertibleToT = false>