revert: re PR c++/71737 (ICE following 2x pack expansion in non-pack with template alias)

/c-family
2017-01-16  Paolo Carlini  <paolo.carlini@oracle.com>

	Revert:
     	2017-01-16  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/71737
	* c-common.c (set_underlying_type): Always set DECL_ORIGINAL_TYPE.

/testsuite
2017-01-16  Paolo Carlini  <paolo.carlini@oracle.com>

	Revert:
        2017-01-16  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/71737
	* g++.dg/cpp0x/pr71737.C: New.

From-SVN: r244496

gcc/c-family/ChangeLog

 2017-01-16  Paolo Carlini  <paolo.carlini@oracle.com>
 
+	Revert:
+     	2017-01-16  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/71737
+	* c-common.c (set_underlying_type): Always set DECL_ORIGINAL_TYPE.
+
+2017-01-16  Paolo Carlini  <paolo.carlini@oracle.com>
+
 	PR c++/71737
 	* c-common.c (set_underlying_type): Always set DECL_ORIGINAL_TYPE.
 

gcc/c-family/c-common.c

@@ -7419,18 +7419,16 @@ set_underlying_type (tree x)
       if (TYPE_NAME (TREE_TYPE (x)) == 0)
 	TYPE_NAME (TREE_TYPE (x)) = x;
     }
-  else if (DECL_ORIGINAL_TYPE (x) == NULL_TREE)
+  else if (TREE_TYPE (x) != error_mark_node
+	   && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
     {
       tree tt = TREE_TYPE (x);
       DECL_ORIGINAL_TYPE (x) = tt;
-      if (tt != error_mark_node)
-	{
-	  tt = build_variant_type_copy (tt);
-	  TYPE_STUB_DECL (tt) = TYPE_STUB_DECL (DECL_ORIGINAL_TYPE (x));
-	  TYPE_NAME (tt) = x;
-	  TREE_USED (tt) = TREE_USED (x);
-	  TREE_TYPE (x) = tt;
-	}
+      tt = build_variant_type_copy (tt);
+      TYPE_STUB_DECL (tt) = TYPE_STUB_DECL (DECL_ORIGINAL_TYPE (x));
+      TYPE_NAME (tt) = x;
+      TREE_USED (tt) = TREE_USED (x);
+      TREE_TYPE (x) = tt;
     }
 }
 

gcc/testsuite/ChangeLog

+2017-01-16  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	Revert:
+        2017-01-16  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/71737
+	* g++.dg/cpp0x/pr71737.C: New.
+
 2017-01-16  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
 
 	* gcc.target/powerpc/swaps-p8-27.c: New.

gcc/testsuite/g++.dg/cpp0x/pr71737.C

-// PR c++/78765
-// { dg-do compile { target c++11 } }
-
-template <template <typename ...> class TT>
-struct quote {
-  template <typename ...Ts>
-  using apply = TT<Ts...>;  // { dg-error "pack expansion" }
-};
-
-template <typename>
-using to_int_t = int;
-
-using t = quote<quote<to_int_t>::apply>::apply<int>;