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c++: add comment
author
Jason Merrill
<jason@redhat.com>
Thu, 3 Feb 2022 21:23:24 +0000
(16:23 -0500)
committer
Jason Merrill
<jason@redhat.com>
Sat, 5 Feb 2022 05:56:05 +0000
(
00:56
-0500)
gcc/cp/ChangeLog:
* pt.cc (iterative_hash_template_arg): Add comment.
gcc/cp/pt.cc
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diff --git
a/gcc/cp/pt.cc
b/gcc/cp/pt.cc
index
60641d8
..
f640612
100644
(file)
--- a/
gcc/cp/pt.cc
+++ b/
gcc/cp/pt.cc
@@
-1797,6
+1797,10
@@
iterative_hash_template_arg (tree arg, hashval_t val)
switch (code)
{
case ARGUMENT_PACK_SELECT:
+ /* Getting here with an ARGUMENT_PACK_SELECT means we're probably
+ preserving it in a hash table, which is bad because it will change
+ meaning when gen_elem_of_pack_expansion_instantiation changes the
+ ARGUMENT_PACK_SELECT_INDEX. */
gcc_unreachable ();
case ERROR_MARK: