[Bug c++/125111] [reflection] "internal compiler error: error reporting routines re-entered" when calling`std::meta::extract` with reference to function

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125111

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I was thinking of
--- gcc/cp/reflect.cc.jj        2026-05-01 21:47:53.656712280 +0200
+++ gcc/cp/reflect.cc   2026-05-04 16:24:08.170041771 +0200
@@ -7453,6 +7453,11 @@ extract_ref (location_t loc, const const
     {
       if (TYPE_REF_P (type))
        type = TREE_TYPE (type);
+      if (TREE_CODE (type) == FUNCTION_TYPE
+         || TREE_CODE (type) == METHOD_TYPE
+         || (TREE_CODE (type) == ARRAY_TYPE
+             && TYPE_DOMAIN (type) == NULL_TREE))
+       return error_mark_node;
       type = build_cplus_array_type (type, NULL_TREE);
       return build_pointer_type (type);
     };
@@ -7462,7 +7467,11 @@ extract_ref (location_t loc, const const
     {
       /* The wording is saying that U is the type of r.  */
       tree U = TREE_TYPE (r);
-      if (is_convertible (adjust_type (U), adjust_type (T))
+      tree adju = adjust_type (U);
+      tree adjt = adjust_type (T);
+      if (adju != error_mark_node
+         && adjt != error_mark_node
+         && is_convertible (adju, adjt)
          && (!var_p || is_constant_expression (r)))
        {
          if (TYPE_REF_P (TREE_TYPE (r)))
plus testsuite coverage.