`make_opaque_handle()` causes compiler to segfault when defining constexpr local shorthand for local class"s `noexcept`s: `is_nothrow`

Fortune for opaque_handle's current commit: Future small blessing − 末小吉

include/opaque.hh

@@ -210,7 +210,7 @@ concept OpaqueHandleFunc = std::is_invocable_v<F, T*, opaque_handle_operation>
 template<typename T, OpaqueHandleFunc<T> HandleF> // Note: This should be a lambda, or a free-function. it's lifetime must not end before the `opaque_handle` returned from this function does.
 constexpr inline opaque_handle make_opaque_handle(T* data, const HandleF& handler) noexcept
 {
-	constexpr bool is_nothrow = std::is_nothrow_invocable_v<HandleF, T*, opaque_handle_operation>;
+	constexpr const bool is_nothrow = std::is_nothrow_invocable_v<HandleF, T*, opaque_handle_operation>;
 
 	struct object_handler 
 	{
@@ -242,8 +242,8 @@ constexpr inline opaque_handle make_opaque_handle(T* data, const HandleF& handle
 template<typename T, OpaqueHandleFunc<T> HandleF> 
 constexpr inline opaque_handle make_opaque_handle(T* data, HandleF&& handler) noexcept(std::is_nothrow_move_constructible_v<HandleF>)
 {
-	constexpr bool is_nothrow = std::is_nothrow_invocable_v<HandleF, T*, opaque_handle_operation>;
+	constexpr const bool is_nothrow = std::is_nothrow_invocable_v<HandleF, T*, opaque_handle_operation>;
-	constexpr bool is_nothrow_ctor = std::is_nothrow_move_constructible_v<HandleF>;
+	constexpr const bool is_nothrow_ctor = std::is_nothrow_move_constructible_v<HandleF>;
 
 	struct object_handler 
 	{

src/main.cpp

@@ -27,9 +27,25 @@ static inline void print(const std::string& string)
 	return print_view(sv);
 }
 
+void use_moh()
+{
+	std::string str{"Hello from 2!"};
+	opaque_handle v{make_opaque_handle<std::string>(&str, [](std::string* ptr, auto op) noexcept {
+		if(ptr) {
+			switch(op) {
+				case opaque_handle_operation::Clone: return new std::string(*ptr);
+				case opaque_handle_operation::Delete: delete ptr; break;
+			}
+		}
+		return static_cast<std::string*>(nullptr);
+	})};
+	print(*v);
+}
+
 int main()
 {
 	const opaque_handle v{make_opaque_object_handle(std::string{"Hello world"})};
 	print(*v); //XXX: Why does converting it to string_view here break it?
+	use_moh();
 	return 0;
 }