1 files changed, 15 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/c23-unproto-4.c b/gcc/testsuite/gcc.dg/c23-unproto-4.c
new file mode 100644
index 0000000..7321753
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/c23-unproto-4.c
@@ -0,0 +1,15 @@
+/* Test that declaring a function with () is the same as (void) in C23.
+   Invalid use cases.  */
+/* { dg-do compile } */
+/* { dg-options "-std=c23 -pedantic-errors" } */
+
+void f1 (); /* { dg-message "previous declaration" } */
+void f1 (int); /* { dg-error "conflicting types" } */
+
+void f2 (); /* { dg-message "declared here" } */
+
+void
+f3 (void)
+{
+  f2 (1); /* { dg-error "too many arguments" } */
+}