new file mode 100644
@@ -0,0 +1,21 @@
+// PR c++/100557
+// { dg-do compile { target c++20 } }
+
+template <typename _Tp> _Tp declval();
+
+struct print_tag_;
+
+bool tag_invoke(print_tag_, auto);
+bool tag_invoke(print_tag_, auto obj) requires requires { *obj; };
+
+template <typename CPO, typename... Args>
+auto try_tag_invoke() noexcept(tag_invoke(declval<CPO>, declval<Args>()...)) // { dg-error "no matching function for call" }
+ -> decltype(tag_invoke(CPO(), declval<Args>()...));
+
+struct print_tag_ {
+ void operator()(auto... args) noexcept(noexcept( try_tag_invoke<print_tag_, decltype(args)...>()));
+} print;
+
+void foo() {
+ print(0);
+}