--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp1y/pr84588-2.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,25 @@
+// { dg-do compile { target c++14 } }
+
+struct a {
+  void b() {}
+  void c(void (*) () = [] {
+      if (a a(int auto))  // { dg-error "two or more data types|condition declares a function" }
+      ;
+  }) {}
+};
+
+struct d {
+  void e() {}
+  void f(void (*) () = [] {
+      for (;d d(int auto);)  // { dg-error "two or more data types|condition declares a function" }
+      ;
+  }) {}
+};
+
+struct g {
+  void h() {}
+  void i(void (*) () = [] {
+      while (g g(int auto))  // { dg-error "two or more data types|condition declares a function" }
+      ;
+  }) {}
+};