PR c++/85148 - ICE with 'this' in array NSDMI.

	* tree.c (replace_placeholders_r): Use handled_component_p.

From-SVN: r259088

gcc/cp/ChangeLog

+2018-04-04  Jason Merrill  <jason@redhat.com>
+
+	PR c++/85148 - ICE with 'this' in array NSDMI.
+	* tree.c (replace_placeholders_r): Use handled_component_p.
+
 2018-04-04  Ville Voutilainen  <ville.voutilainen@gmail.com>
 
 	PR c++/65923

gcc/cp/tree.c

@@ -3145,7 +3145,7 @@ replace_placeholders_r (tree* t, int* walk_subtrees, void* data_)
 	for (; !same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (*t),
 							   TREE_TYPE (x));
 	     x = TREE_OPERAND (x, 0))
-	  gcc_assert (TREE_CODE (x) == COMPONENT_REF);
+	  gcc_assert (handled_component_p (x));
 	*t = unshare_expr (x);
 	*walk_subtrees = false;
 	d->seen = true;

gcc/testsuite/g++.dg/cpp1y/nsdmi-aggr11.C

+// PR c++/85148
+// { dg-do compile { target c++14 } }
+
+template<typename T> struct A
+{
+  T x[1]{(__PTRDIFF_TYPE__)this};
+};
+
+void foo()
+{
+  A<A<__PTRDIFF_TYPE__>> a{};
+}