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From: Patrick Palka <ppalka@gcc.gnu.org>
To: gcc-cvs@gcc.gnu.org
Subject: [gcc r12-7488] c++: Add testcase for already fixed PR [PR103443]
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https://gcc.gnu.org/g:074d283e249c7295d783a08eb6f0219a7f411c50

commit r12-7488-g074d283e249c7295d783a08eb6f0219a7f411c50
Author: Patrick Palka <ppalka@redhat.com>
Date:   Fri Mar 4 10:17:30 2022 -0500

    c++: Add testcase for already fixed PR [PR103443]
    
    Fixed by r12-7264.
    
            PR c++/103443
    
    gcc/testsuite/ChangeLog:
    
            * g++.dg/cpp2a/consteval29.C: New test.

Diff:
---
 gcc/testsuite/g++.dg/cpp2a/consteval29.C | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/gcc/testsuite/g++.dg/cpp2a/consteval29.C b/gcc/testsuite/g++.dg/cpp2a/consteval29.C
new file mode 100644
index 00000000000..61590225bd6
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/consteval29.C
@@ -0,0 +1,20 @@
+// PR c++/103443
+// { dg-do compile { target c++20 } }
+
+template<int...>
+struct A { };
+
+template<int... Is>
+consteval unsigned index_sequence2mask(A<Is...>) {
+  if constexpr (sizeof...(Is) == 0u)
+    return 0u;
+  else
+    return ((1u << Is) | ...);
+}
+
+template<unsigned Mask = index_sequence2mask(A<1,2,3>{})>
+void use_mask();
+
+int main() {
+  use_mask();
+}