PR c++/70778 - member template template parameter

	* pt.c (tsubst): Also substitute into the template of a
	BOUND_TEMPLATE_TEMPLATE_PARM.

From-SVN: r238686

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index c9a28aed253428ee0806d7c4afe6eedc91c1607f..e5275f51020b646ec073adc5f1bd24f8f5e9178a 100644 (file)
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,5 +1,9 @@
 2016-07-23  Jason Merrill  <jason@redhat.com>
 
+       PR c++/70778
+       * pt.c (tsubst): Also substitute into the template of a
+       BOUND_TEMPLATE_TEMPLATE_PARM.
+
        PR c++/71738
        * pt.c (lookup_template_class_1): Handle getting template from tsubst.
 

diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index a44beadd8afc57032e9589b7e7bd186ce88ffa31..65fa98258624407e854804893bdbba08ed2f3a04 100644 (file)
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -13232,13 +13232,20 @@ tsubst (tree t, tree args, tsubst_flags_t complain, tree in_decl)
 
                if (code == BOUND_TEMPLATE_TEMPLATE_PARM)
                  {
-                   tree argvec = tsubst (TYPE_TI_ARGS (t), args,
+                   tree tinfo = TYPE_TEMPLATE_INFO (t);
+                   /* We might need to substitute into the types of non-type
+                      template parameters.  */
+                   tree tmpl = tsubst (TI_TEMPLATE (tinfo), args,
+                                       complain, in_decl);
+                   if (tmpl == error_mark_node)
+                     return error_mark_node;
+                   tree argvec = tsubst (TI_ARGS (tinfo), args,
                                          complain, in_decl);
                    if (argvec == error_mark_node)
                      return error_mark_node;
 
                    TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (r)
-                     = build_template_info (TYPE_TI_TEMPLATE (t), argvec);
+                     = build_template_info (tmpl, argvec);
                  }
              }
            break;

diff --git a/gcc/testsuite/g++.dg/template/ttp29.C b/gcc/testsuite/g++.dg/template/ttp29.C
new file mode 100644 (file)
index 0000000..7d4e03a
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/ttp29.C
@@ -0,0 +1,21 @@
+// PR c++/70778
+
+template <class KeyType>
+struct Stuff
+{
+  template <KeyType, class>
+  struct AddToFront;
+
+  template <KeyType ToAdd, template<KeyType> class Holder, KeyType Indexs>
+  struct AddToFront<ToAdd, Holder<Indexs> >
+  {
+  };
+};
+
+template <unsigned>
+struct Holder {};
+
+int main()
+{
+  Stuff<unsigned>::AddToFront<0, Holder<24> > t;
+}