diff --git a/gcc/testsuite/rust/compile/invalid_variadics.rs b/gcc/testsuite/rust/compile/invalid_variadics.rs
new file mode 100644
index 000000000000..5706b673791b
--- /dev/null
+++ b/gcc/testsuite/rust/compile/invalid_variadics.rs
@@ -0,0 +1,6 @@
+extern "C" {
+    pub fn dog(b: i32, a: ..., c: i32);
+    // { dg-error "..... must be the last argument of a C-variadic function" "" { target *-*-* } .-1 }
+    pub fn cat(a: ...);
+    // { dg-error "C-variadic function must be declared with at least one named argument" "" { target *-*-* } .-1 }
+}