From f8093854c78f820a4f0202fd4db7bba0ee0573c8 Mon Sep 17 00:00:00 2001
From: Jason Merrill <jason@redhat.com>
Date: Tue, 15 Mar 2022 16:23:47 -0400
Subject: [PATCH] c++: add comment

gcc/cp/ChangeLog:

	* pt.cc (determine_specialization): Add comment.
---
 gcc/cp/pt.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
index cd07e48..ece839c 100644
--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -2325,6 +2325,8 @@ determine_specialization (tree template_id,
 		continue;
 	      if (freq)
 		{
+		  /* C++20 CA104: Substitute directly into the
+		     constraint-expression.  */
 		  tree fargs = DECL_TI_ARGS (fn);
 		  tsubst_flags_t complain = tf_none;
 		  freq = tsubst_constraint (freq, fargs, complain, fn);
-- 
2.7.4