Fix build

Author: eel76-hmi

include/traits.h

@@ -193,16 +193,10 @@ template <typename Ret, typename... Args>
 struct canonical_function<Ret(target const&, Args...)> : std::type_identity<Ret(Args...) const> {};
 
 template <typename Ret, typename... Args>
-struct canonical_function<Ret(target&, Args...) const> {
-    static_assert(false, "A target function signature cannot have a const modifier!");
-    using type = Ret(Args...);
-};
+struct canonical_function<Ret(target&, Args...) const> {};
 
 template <typename Ret, typename... Args>
-struct canonical_function<Ret(target const&, Args...) const> {
-    static_assert(false, "A target function signature cannot have a const modifier!");
-    using type = Ret(Args...) const;
-};
+struct canonical_function<Ret(target const&, Args...) const> {};
 
 template <function_type FunctionType>
 using canonical_function_t = typename canonical_function<FunctionType>::type;
@@ -1160,8 +1154,8 @@ struct variant_constraint {
 
     template <typename T>
     constexpr auto operator()() const noexcept {
-        return (... or std::same_as<T, Alternatives>) and
-               OtherConstraints{}.template operator()<T>();
+        return (... or std::same_as<T, Alternatives>)and OtherConstraints{}
+            .template operator()<T>();
     }
 };