--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/parse/cond6.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,16 @@
+// PR c++/84588
+
+void foo()
+{
+  if (int bar());  // { dg-error "condition declares a function" }
+
+  for (;int bar(););  // { dg-error "condition declares a function" }
+
+  while (int bar());  // { dg-error "condition declares a function" }
+
+  if (int a[]);  // { dg-error "condition declares an array" }
+
+  for (;int a[];);  // { dg-error "condition declares an array" }
+
+  while (int a[]);  // { dg-error "condition declares an array" }
+}