From 8b449dcd84334068c769a2f427812dadb95e61de Mon Sep 17 00:00:00 2001
From: Marek Polacek <polacek@redhat.com>
Date: Tue, 20 Sep 2022 14:54:57 -0400
Subject: [PATCH] c++: ICE-on-invalid with designated initializer [PR106983]

We ICE in the code added in r12-7117: type_build_dtor_call gets
the error_mark_node because the type of 'prev' wasn't declared.

	PR c++/106983

gcc/cp/ChangeLog:

	* typeck2.cc (split_nonconstant_init_1): Check TYPE_P.

gcc/testsuite/ChangeLog:

	* g++.dg/other/error36.C: New test.
---
 gcc/cp/typeck2.cc                    |  2 +-
 gcc/testsuite/g++.dg/other/error36.C | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/g++.dg/other/error36.C

diff --git a/gcc/cp/typeck2.cc b/gcc/cp/typeck2.cc
index 688e9c1..75fd0e2 100644
--- a/gcc/cp/typeck2.cc
+++ b/gcc/cp/typeck2.cc
@@ -597,7 +597,7 @@ split_nonconstant_init_1 (tree dest, tree init, bool last,
 		    if (prev == field_index)
 		      break;
 		    tree ptype = TREE_TYPE (prev);
-		    if (type_build_dtor_call (ptype))
+		    if (TYPE_P (ptype) && type_build_dtor_call (ptype))
 		      {
 			tree pcref = build3 (COMPONENT_REF, ptype, dest, prev,
 					     NULL_TREE);
diff --git a/gcc/testsuite/g++.dg/other/error36.C b/gcc/testsuite/g++.dg/other/error36.C
new file mode 100644
index 0000000..5562878
--- /dev/null
+++ b/gcc/testsuite/g++.dg/other/error36.C
@@ -0,0 +1,13 @@
+// PR c++/106983
+// { dg-do compile { target c++20 } }
+
+typedef unsigned long long A;
+typedef union
+{
+  struct B s; // { dg-error "incomplete" }
+  A a;
+} U;
+void f (A x, unsigned int b)
+{
+  const U y = {.a = x};
+}
-- 
2.7.4