1 files changed, 14 insertions, 0 deletions
diff --git a/test/SemaCXX/vla.cpp b/test/SemaCXX/vla.cpp
index d63b6335f4533..dae6450553aa3 100644
--- a/test/SemaCXX/vla.cpp
+++ b/test/SemaCXX/vla.cpp
@@ -3,3 +3,17 @@
 // PR11925
 int n;
 int (&f())[n]; // expected-error {{function declaration cannot have variably modified type}}
+
+namespace PR18581 {
+  template<typename T> struct pod {};
+  template<typename T> struct error {
+    typename T::error e; // expected-error {{cannot be used prior to '::'}}
+  };
+  struct incomplete; // expected-note {{forward declaration}}
+
+  void f(int n) {
+    pod<int> a[n];
+    error<int> b[n]; // expected-note {{instantiation}}
+    incomplete c[n]; // expected-error {{incomplete}}
+  }
+}