C++ PATCH for c++/56268 (ICE with __has_nothrow_copy)

[Jason Merrill]

Another missing maybe_instantiate_noexcept.

Tested x86_64-pc-linux-gnu, applying to trunk and 4.7.

commit 1a9ad88eb3e501aed25ca6542776aacf431c7adc
Author: Jason Merrill <ja...@redhat.com>
Date:   Sat Feb 9 15:58:29 2013 -0500

    	PR c++/56268
    	* semantics.c (classtype_has_nothrow_assign_or_copy_p): Call
    	maybe_instantiate_noexcept.

diff --git a/gcc/cp/semantics.c b/gcc/cp/semantics.c
index f8b37c1..e3dea09 100644
--- a/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@ -5413,6 +5413,7 @@ classtype_has_nothrow_assign_or_copy_p (tree type, bool assign_p)
       else if (copy_fn_p (fn) <= 0)
 	continue;
 
+      maybe_instantiate_noexcept (fn);
       if (!TYPE_NOTHROW_P (TREE_TYPE (fn)))
 	return false;
     }
diff --git a/gcc/testsuite/g++.dg/ext/has_nothrow_copy-8.C b/gcc/testsuite/g++.dg/ext/has_nothrow_copy-8.C
new file mode 100644
index 0000000..e1be1a0
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/has_nothrow_copy-8.C
@@ -0,0 +1,19 @@
+// PR c++/56268
+// { dg-options -std=c++11 }
+
+template <class T>
+struct A {
+  A(const A&) noexcept (T::value);
+};
+
+struct B {
+  static const bool value = true;
+};
+
+template <class T>
+struct C {
+  static const bool value = __has_nothrow_copy (T);
+};
+
+#define SA(X) static_assert((X),#X)
+SA(C<A<B>>::value);