diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index f5d92b6704c..56871ba51f9 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2019-03-26  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/84598
+	* g++.dg/ext/pr84598.C: New.
+
 2019-03-26  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/89796
diff --git a/gcc/testsuite/g++.dg/ext/pr84598.C b/gcc/testsuite/g++.dg/ext/pr84598.C
new file mode 100644
index 00000000000..05016b82b8c
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/pr84598.C
@@ -0,0 +1,3 @@
+// { dg-options "-fpermissive -w" }
+
+template<int b> __attribute__ a([] { class c, __attribute__(vector_size(operator+()))) d;  // { dg-error "expected" }