PR c++/88196 - ICE with class non-type template parameter.

	* pt.c (convert_nontype_argument): If the expr is a PTRMEM_CST, also
	check if the type we're converting it to is TYPE_PTRMEM_P.

	* g++.dg/cpp0x/ptrmem-cst-arg1.C: Tweak dg-error.
	* g++.dg/cpp2a/nontype-class10.C: New test.
	* g++.dg/template/pr54858.C: Tweak dg-error.

From-SVN: r267319

gcc/cp/ChangeLog

+2018-12-20  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/88196 - ICE with class non-type template parameter.
+	* pt.c (convert_nontype_argument): If the expr is a PTRMEM_CST, also
+	check if the type we're converting it to is TYPE_PTRMEM_P.
+
 2018-12-20  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR c/51628

gcc/cp/pt.c

@@ -6775,7 +6775,7 @@ convert_nontype_argument (tree type, tree expr, tsubst_flags_t complain)
      to a null value, but otherwise still need to be of a specific form.  */
   if (cxx_dialect >= cxx11)
     {
-      if (TREE_CODE (expr) == PTRMEM_CST)
+      if (TREE_CODE (expr) == PTRMEM_CST && TYPE_PTRMEM_P (type))
 	/* A PTRMEM_CST is already constant, and a valid template
 	   argument for a parameter of pointer to member type, we just want
 	   to leave it in that form rather than lower it to a

gcc/testsuite/ChangeLog

+2018-12-20  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/88196 - ICE with class non-type template parameter.
+	* g++.dg/cpp0x/ptrmem-cst-arg1.C: Tweak dg-error.
+	* g++.dg/cpp2a/nontype-class10.C: New test.
+	* g++.dg/template/pr54858.C: Tweak dg-error.
+
 2018-12-20  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR c/51628

gcc/testsuite/g++.dg/cpp0x/ptrmem-cst-arg1.C

@@ -5,5 +5,5 @@ template<int> struct A {};
 struct B
 {
     int i;
-    A<&B::i> a; // { dg-error "could not convert template argument" }
+    A<&B::i> a; // { dg-error "could not convert" }
 };

gcc/testsuite/g++.dg/cpp2a/nontype-class10.C

+// PR c++/88196
+// { dg-do compile { target c++2a } }
+
+struct C { C *c; };
+template <C> struct D;
+D <&C::c> d; // { dg-error "could not convert" }

gcc/testsuite/g++.dg/template/pr54858.C

@@ -5,17 +5,17 @@ template <int> struct A {};
 template <typename T, T *> struct B {};
 template <typename D> struct C
 {
-  A<0> c0; B<A<0>, &C::c0> d0;	// { dg-error "could not convert template argument" }
-  A<0> c1; B<A<0>, &C::c1> d1;	// { dg-error "could not convert template argument" }
-  A<0> c2; B<A<0>, &C::c2> d2;	// { dg-error "could not convert template argument" }
-  A<0> c3; B<A<0>, &C::c3> d3;	// { dg-error "could not convert template argument" }
-  A<0> c4; B<A<0>, &C::c4> d4;	// { dg-error "could not convert template argument" }
-  A<0> c5; B<A<0>, &C::c5> d5;	// { dg-error "could not convert template argument" }
-  A<0> c6; B<A<0>, &C::c6> d6;	// { dg-error "could not convert template argument" }
-  A<0> c7; B<A<0>, &C::c7> d7;	// { dg-error "could not convert template argument" }
-  A<0> c8; B<A<0>, &C::c8> d8;	// { dg-error "could not convert template argument" }
-  A<0> c9; B<A<0>, &C::c9> d9;	// { dg-error "could not convert template argument" }
-  A<0> ca; B<A<0>, &C::ca> da;	// { dg-error "could not convert template argument" }
-  A<0> cb; B<A<0>, &C::cb> db;	// { dg-error "could not convert template argument" }
+  A<0> c0; B<A<0>, &C::c0> d0;	// { dg-error "could not convert" }
+  A<0> c1; B<A<0>, &C::c1> d1;	// { dg-error "could not convert" }
+  A<0> c2; B<A<0>, &C::c2> d2;	// { dg-error "could not convert" }
+  A<0> c3; B<A<0>, &C::c3> d3;	// { dg-error "could not convert" }
+  A<0> c4; B<A<0>, &C::c4> d4;	// { dg-error "could not convert" }
+  A<0> c5; B<A<0>, &C::c5> d5;	// { dg-error "could not convert" }
+  A<0> c6; B<A<0>, &C::c6> d6;	// { dg-error "could not convert" }
+  A<0> c7; B<A<0>, &C::c7> d7;	// { dg-error "could not convert" }
+  A<0> c8; B<A<0>, &C::c8> d8;	// { dg-error "could not convert" }
+  A<0> c9; B<A<0>, &C::c9> d9;	// { dg-error "could not convert" }
+  A<0> ca; B<A<0>, &C::ca> da;	// { dg-error "could not convert" }
+  A<0> cb; B<A<0>, &C::cb> db;	// { dg-error "could not convert" }
 };
 C<int> e;