From 3d1c3406c5da06567e4ecdc5b2a35c2be93660ba Mon Sep 17 00:00:00 2001
From: jason <jason@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue, 16 Jun 2015 14:48:56 +0000
Subject: 	PR c++/66387 	* pt.c (tsubst_copy) [VAR_DECL]: Use
 process_outer_var_ref.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@224521 138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/cp/ChangeLog                                 |   5 +
 gcc/cp/pt.c                                      |   6 +-
 gcc/cp/semantics.c                               |   2 +
 gcc/testsuite/g++.dg/cpp1y/lambda-generic-ice2.C | 123 +++++++++++++++++++++++
 4 files changed, 132 insertions(+), 4 deletions(-)
 create mode 100644 gcc/testsuite/g++.dg/cpp1y/lambda-generic-ice2.C

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 15766f4d726..1ab5e8f2c3f 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,8 @@
+2015-06-16  Jason Merrill  <jason@redhat.com>
+
+	PR c++/66387
+	* pt.c (tsubst_copy) [VAR_DECL]: Use process_outer_var_ref.
+
 2015-06-15  Nathan Sidwell  <nathan@acm.org>
 
 	PR c++/58583
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index ea8c8b65a3f..9236311329d 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -13071,10 +13071,8 @@ tsubst_copy (tree t, tree args, tsubst_flags_t complain, tree in_decl)
 		      if (TREE_STATIC (r))
 			rest_of_decl_compilation (r, toplevel_bindings_p (),
 						  at_eof);
-		      else if (decl_constant_var_p (r))
-			/* A use of a local constant decays to its value.
-			   FIXME update for core DR 696.  */
-			r = scalar_constant_value (r);
+		      else
+			r = process_outer_var_ref (r, complain);
 		    }
 		}
 	      /* Remember this for subsequent uses.  */
diff --git a/gcc/cp/semantics.c b/gcc/cp/semantics.c
index 59ec9047c26..a1519b9e608 100644
--- a/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@ -3103,6 +3103,8 @@ process_outer_var_ref (tree decl, tsubst_flags_t complain)
   if (cp_unevaluated_operand)
     /* It's not a use (3.2) if we're in an unevaluated context.  */
     return decl;
+  if (decl == error_mark_node)
+    return decl;
 
   tree context = DECL_CONTEXT (decl);
   tree containing_function = current_function_decl;
diff --git a/gcc/testsuite/g++.dg/cpp1y/lambda-generic-ice2.C b/gcc/testsuite/g++.dg/cpp1y/lambda-generic-ice2.C
new file mode 100644
index 00000000000..57e0ad2b288
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1y/lambda-generic-ice2.C
@@ -0,0 +1,123 @@
+// PR c++/66387
+// { dg-do compile { target c++14 } }
+
+namespace boost {
+namespace hana {
+namespace detail {
+namespace std {
+using size_t = decltype(0);
+}
+}
+namespace ic_detail {
+template <typename T, T> struct _with_index {
+  template <typename F> constexpr void operator()(F &&) const;
+};
+template <typename T, T v> struct _times { _with_index<T, v> with_index; };
+}
+template <typename T, T v> struct _integral_constant {
+  using value_type = T;
+  operator value_type() const;
+  ic_detail::_times<T, v> times;
+};
+template <detail::std::size_t i>
+constexpr _integral_constant<detail::std::size_t, i> size_t{};
+template <typename, typename = void> struct datatype;
+}
+}
+namespace std {
+typedef int size_t;
+inline namespace __cxx11 {}
+}
+namespace boost {
+namespace hana {
+template <bool> struct when;
+template <typename, typename, typename> struct to_impl;
+template <typename T, typename> struct datatype : datatype<T, when<true>> {};
+template <typename T, bool condition> struct datatype<T, when<condition>> {
+  using type = typename T::hana::datatype;
+};
+template <typename> struct _models;
+template <typename To, typename From>
+    struct to_impl < To,
+    From, when < _models<From> {
+} >> ;
+namespace detail {
+namespace std {
+template <typename T, T> struct integer_sequence;
+template <size_t... n> using index_sequence = integer_sequence<size_t, n...>;
+namespace int_seq_detail {
+template <size_t> struct make_index_sequence {
+  using type = index_sequence<0>;
+};
+template <typename, typename> struct cast_to;
+template <typename T, typename U, U... u>
+struct cast_to<T, integer_sequence<U, u...>> {
+  using type = integer_sequence<T, u...>;
+};
+}
+template <typename T, T>
+using make_integer_sequence = typename int_seq_detail::cast_to<
+    T, int_seq_detail::make_index_sequence<1>::type>::type;
+}
+}
+namespace ic_detail {
+template <typename T, T N, typename = detail::std::make_integer_sequence<T, N>>
+struct go;
+template <typename T, T N, T... i>
+struct go<T, N, detail::std::integer_sequence<T, i...>> {
+  using swallow = T;
+  template <typename F> static void with_index(F f) {
+    swallow{(f(_integral_constant<T, i>{}), 0)...};
+  }
+};
+template <typename T, T v>
+template <typename F>
+constexpr void _with_index<T, v>::operator()(F &&f) const {
+  go<T, 0>::with_index(f);
+}
+}
+}
+}
+namespace std {
+template <typename> class allocator;
+template <class> struct char_traits;
+template <typename _CharT, typename = char_traits<_CharT>> class basic_ostream;
+namespace __cxx11 {
+template <typename _CharT, typename = char_traits<_CharT>,
+          typename = allocator<_CharT>>
+class basic_stringstream;
+}
+typedef basic_ostream<char> ostream;
+typedef basic_stringstream<char> stringstream;
+template <typename, typename> class basic_ostream {};
+template <typename _CharT, typename>
+class basic_iostream : public basic_ostream<_CharT> {};
+namespace __cxx11 {
+template <typename _CharT, typename _Traits, typename>
+class basic_stringstream : public basic_iostream<_CharT, _Traits> {};
+}
+}
+namespace hana = boost::hana;
+template <typename> struct print_impl;
+template <typename X> void print(std::ostream os, X x) {
+  using Tag = typename hana::datatype<X>::type;
+  print_impl<Tag>::apply(os, x);
+}
+struct Vector;
+template <typename, typename> struct vector2 {
+  struct hana {
+    using datatype = Vector;
+  };
+  static constexpr std::size_t size = 0;
+};
+template <> struct print_impl<Vector> {
+  template <typename vectorN> static void apply(std::ostream, vectorN) {
+    constexpr auto N = hana::size_t<vectorN::size>;
+    N.times.with_index([&](auto) { N - hana::size_t<1>; });
+  }
+};
+int main() {
+  std::stringstream ss;
+  vector2<int, char> v2;
+  print(ss, v2);
+}
-- 
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