1 files changed, 13 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/pr22308-1.c b/gcc/testsuite/gcc.dg/pr22308-1.c
new file mode 100644
index 000000000..2b3067577
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr22308-1.c
@@ -0,0 +1,13 @@
+/* Bug 22308: C_TYPE_FIELDS_READONLY not updated on type variants.  */
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+struct foo s;
+volatile struct foo t;
+struct foo { const int z; };
+
+void
+bar (void)
+{
+  t = s; /* { dg-error "assignment of read-only variable 't'" } */
+}