[PATCH] c++: ICE-on-invalid with designated initializer [PR106983]

[Marek Polacek via Gcc-patches]

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.

Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk?

        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 688e9c15326..75fd0e2a9bf 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 00000000000..556287816fd
--- /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};
+}

base-commit: be60aa5b608b5f09fadfeff852a46589ac311a42
-- 
2.37.3