Remove Doxygen warnings.

include/boost/hana/functional.hpp

@@ -177,16 +177,20 @@ namespace boost { namespace hana {
 
     ### Example
     @snippet example/functional/fix.cpp main
+
+    @todo
+    Find a simpler way to make `f` dependent in `operator()(...)`.
      */
     constexpr struct {
+        //! @cond
         template <typename F>
         constexpr auto operator()(F f) const {
             auto fst = [](auto a, ...) { return a; };
-            //! @todo Find a simpler way to make `f` dependent.
             return [=](auto ...xs) {
                 return f((*this)(fst(f, xs...)), xs...);
             };
         }
+        //! @endcond
     } fix{};
 
     //! Returns a function invoking `f` with its two first arguments reversed.

include/boost/hana/list.hpp

@@ -66,6 +66,7 @@ namespace boost { namespace hana {
             using hana_datatype = List;
 
             struct {
+                //! @cond
                 template <typename F, typename ...Xs>
                 static constexpr auto call(F f, list_detail::type_container<Xs...>)
                 { return f(type<Xs>...); }
@@ -73,6 +74,7 @@ namespace boost { namespace hana {
                 template <typename F>
                 constexpr auto operator()(F f) const
                 { return call(f, typename HiddenTypeContainer::contents{}); }
+                //! @endcond
             } into;
         };
     }