1 files changed, 14 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/union-cast-3.c b/gcc/testsuite/gcc.dg/union-cast-3.c
new file mode 100644
index 000000000..5f9b9f868
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/union-cast-3.c
@@ -0,0 +1,14 @@
+/* { dg-do compile } */
+/* { dg-options "-std=c99 -pedantic-errors" } */
+/* PR 23155
+   We should get one error messag, one about union cast. */
+
+
+union vx {short f[8]; int v;};
+int vec;
+
+void
+foo5 (int vec)
+{
+  ((union vx) vec).f[5] = 1; /* { dg-error "forbids casts to union type" } */
+}