[PATCH] c++: Fix printing of C++20 template parameter object [PR97014]

[Marek Polacek via Gcc-patches]

No one is interested in the mangled name of the C++20 template parameter
object for a class NTTP.  So instead of printing

  required for the satisfaction of ‘positive<T::ratio>’ [with T = 
X<::_ZTAXtl5ratioLin1ELi2EEE>]

let's print

  required for the satisfaction of ‘positive<T::ratio>’ [with T = X<{-1, 2}>]

I don't think adding a test is necessary for this.

gcc/cp/ChangeLog:

        PR c++/97014
        * cxx-pretty-print.c (pp_cxx_template_argument_list): If the
        argument is template_parm_object_p, print its DECL_INITIAL.
---
 gcc/cp/cxx-pretty-print.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/cp/cxx-pretty-print.c b/gcc/cp/cxx-pretty-print.c
index d10c18db039..8bea79b93a2 100644
--- a/gcc/cp/cxx-pretty-print.c
+++ b/gcc/cp/cxx-pretty-print.c
@@ -1910,6 +1910,8 @@ pp_cxx_template_argument_list (cxx_pretty_printer *pp, 
tree t)
          if (TYPE_P (arg) || (TREE_CODE (arg) == TEMPLATE_DECL
                               && TYPE_P (DECL_TEMPLATE_RESULT (arg))))
            pp->type_id (arg);
+         else if (template_parm_object_p (arg))
+           pp->expression (DECL_INITIAL (arg));
          else
            pp->expression (arg);
        }

base-commit: dfaa24c974bab4bc1bd3840d67ca1701acc0010c
-- 
2.26.2