--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/conversion/ref2.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,29 @@
+// PR c++/88128 - Implement DR 330: Qualification conversions and pointers to
+// arrays of pointers.
+
+int *ar[4];
+/* if at some level k the P2 is more cv-qualified than P1, then there
+   must be a const at every single level (other than level zero) of P2
+   up until k.  */
+const int *(&arp)[4] = ar; // { dg-error "discards qualifiers" }
+const int *const(&arp2)[4] = ar;
+int *const(&arp3)[4] = ar;
+int *(&arp4)[4] = ar;
+
+const int *br[4];
+const int *(&brp)[4] = br;
+const int *const(&brp2)[4] = br;
+int *const(&brp3)[4] = br; // { dg-error "discards qualifiers" }
+int *(&brp4)[4] = br; // { dg-error "discards qualifiers" }
+
+int *c[2][3];
+int const *const (&cp1)[3] = *c;
+int const *(&cp2)[3] = *c; // { dg-error "discards qualifiers" }
+int *const (&cp3)[3] = *c;
+int *(&cp4)[3] = *c;
+
+double *const (*d)[3];
+double const *const (&e)[3] = *d;
+
+int *(*f)[3];
+const int *const (&g)[3] = *f;