@@ -4575,7 +4575,16 @@ process_template_parm (tree list, location_t parm_loc, tree parm,
/* This is for distinguishing between real templates and template
template parameters */
TREE_TYPE (parm) = t;
- TREE_TYPE (DECL_TEMPLATE_RESULT (parm)) = t;
+
+ /* any_template_parm_r expects to be able to get the targs of a
+ DECL_TEMPLATE_RESULT. */
+ tree result = DECL_TEMPLATE_RESULT (parm);
+ TREE_TYPE (result) = t;
+ tree args = template_parms_to_args (DECL_TEMPLATE_PARMS (parm));
+ tree tinfo = build_template_info (parm, args);
+ retrofit_lang_decl (result);
+ DECL_TEMPLATE_INFO (result) = tinfo;
+
decl = parm;
}
else
new file mode 100644
@@ -0,0 +1,16 @@
+// PR c++/95371
+// { dg-do compile { target c++20 } }
+
+template <typename...>
+struct configuration {
+ template <template <typename...> typename query_t>
+ static constexpr bool exists() { return true; }
+
+ template <template <typename...> typename query_t>
+ void remove() requires(exists<query_t>());
+};
+
+int main() {
+ configuration<> cfg{};
+ cfg.remove<configuration>();
+}