PR c++/89917 - ICE with lambda in variadic mem-init.

A mem-initializer is not a type, and we don't want to turn autos within it
into packs.

	* pt.c (make_pack_expansion): Change type_pack_expansion_p to false.

From-SVN: r270111

gcc/cp/ChangeLog

+2019-04-03  Jason Merrill  <jason@redhat.com>
+
+	PR c++/89917 - ICE with lambda in variadic mem-init.
+	* pt.c (make_pack_expansion): Change type_pack_expansion_p to false.
+
 2019-04-01  Jason Merrill  <jason@redhat.com>
 
 	PR c++/86946 - ICE with function call in template argument.

gcc/cp/pt.c

@@ -3933,7 +3933,7 @@ make_pack_expansion (tree arg, tsubst_flags_t complain)
          class expansion.  */
       ppd.visited = new hash_set<tree>;
       ppd.parameter_packs = &parameter_packs;
-      ppd.type_pack_expansion_p = true;
+      ppd.type_pack_expansion_p = false;
       gcc_assert (TYPE_P (TREE_PURPOSE (arg)));
       cp_walk_tree (&TREE_PURPOSE (arg), &find_parameter_packs_r, 
                     &ppd, ppd.visited);

gcc/testsuite/g++.dg/cpp0x/lambda/lambda-variadic8.C

+// PR c++/89917
+// { dg-do compile { target c++11 } }
+
+struct A 
+{
+  A(...);
+};
+
+template<typename... T> struct B : T...
+{
+  B() : T([]{})... {}
+};
+
+B<A> b;