Fix more warnings and errors

Author: ClausKlein

include/beman/inplace_vector/inplace_vector.hpp

@@ -74,7 +74,7 @@ struct inplace_vector_destruct_base {
   inplace_vector_destruct_base(
       const inplace_vector_destruct_base
           &&other) noexcept(std::is_nothrow_move_constructible_v<T>)
-      : elems(), size_(other.size()) {}
+      : elems(), size_(other.size_) {}
 
   inplace_vector_destruct_base &
   operator=(const inplace_vector_destruct_base &other) noexcept(

tests/beman/inplace_vector/inplace_vector.test.cpp

@@ -32,6 +32,7 @@ template <typename T> constexpr void test() {
                              typename vec::const_reference>::value,
                 "");
   assert(front == T(1));
+  (void)front;
 
   auto &&const_front = const_range.front();
   static_assert(