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* [gcc r13-8669] c++: alias CTAD and template template parm [PR114377]
@ 2024-05-01 20:31 Jason Merrill
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From: Jason Merrill @ 2024-05-01 20:31 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:60e1e13f458f1fcfb05a30ace57fa682461e2732
commit r13-8669-g60e1e13f458f1fcfb05a30ace57fa682461e2732
Author: centurion <centurion009@proton.me>
Date: Wed Mar 27 18:36:37 2024 +0000
c++: alias CTAD and template template parm [PR114377]
To match all the other places that pull a _TEMPLATE_PARM out of a
_DECL (get_template_parm_index, etc.).
This change is too small to be legally significant for copyright.
PR c++/114377
gcc/cp/ChangeLog:
* pt.cc (find_template_parameter_info::found): Use TREE_TYPE for
TEMPLATE_DECL instead of DECL_INITIAL.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/class-deduction-alias19.C: New test.
Reviewed-by: Jason Merrill <jason@redhat.com>
(cherry picked from commit 801e82acd6b4f0cf863529875947e394899ea7b9)
Diff:
---
gcc/cp/pt.cc | 3 ++-
gcc/testsuite/g++.dg/cpp2a/class-deduction-alias19.C | 15 +++++++++++++++
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
index a768d11c82f..fa660fcf49e 100644
--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -10917,7 +10917,8 @@ find_template_parameter_info::found (tree parm)
{
if (TREE_CODE (parm) == TREE_LIST)
parm = TREE_VALUE (parm);
- if (TREE_CODE (parm) == TYPE_DECL)
+ if (TREE_CODE (parm) == TYPE_DECL
+ || TREE_CODE (parm) == TEMPLATE_DECL)
parm = TREE_TYPE (parm);
else
parm = DECL_INITIAL (parm);
diff --git a/gcc/testsuite/g++.dg/cpp2a/class-deduction-alias19.C b/gcc/testsuite/g++.dg/cpp2a/class-deduction-alias19.C
new file mode 100644
index 00000000000..1ea79bd7691
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/class-deduction-alias19.C
@@ -0,0 +1,15 @@
+// PR c++/114377
+// { dg-do compile { target c++20 } }
+
+template <template <typename> typename Iterator>
+struct K {};
+
+template <typename C, typename IteratorPolicy>
+class Foo {};
+
+template <typename C, template<typename> typename TTP>
+using Bar = Foo<C, K<TTP>>;
+
+void s() {
+ Bar(1); // { dg-error "failed|no match" }
+}
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