1 files changed, 39 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/template/ctor4.C b/gcc/testsuite/g++.dg/template/ctor4.C
new file mode 100644
index 000000000..18ed628ee
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/ctor4.C
@@ -0,0 +1,39 @@
+// { dg-do compile }
+
+// Copyright (C) 2001 Free Software Foundation, Inc.
+// Contributed by Nathan Sidwell 24 Jun 2004 <nathan@codesourcery.com>
+
+// Origin Rani Sharoni via giovannibajo@libero.it
+// Bug 16174, SFINAE failure.
+
+template <class T> struct K 
+{
+  K();
+
+  K(K<T> & rhs);
+  K(K<T> const& rhs);
+  template <class U> K(K<U> const& rhs);
+
+private:
+  template <class U> struct A;
+  template <class U> struct A< K<U> const>
+  {  typedef typename K<U>::compile_time_error type; };
+
+  // This is used to reject calls to the copy constructor
+  //  with objects which are top-level const. If they are
+  //  const, the specialization of A is instantiated and
+  //  causes a compile time error. Otherwise, the general
+  //  template is picked up, it misses definition, so this
+  //  ctor declaration is rejected by SFINAE and everybody
+  //  is happy.
+  // GCC 3.4.1pre and 3.5.0 always matches A's specialization
+  //  when instantiating from foo(), and this causes the error.
+  template <class U>
+  K(U& rhs, typename A<U>::type = 0);
+};
+
+
+K<int> foo(void)
+{
+  return K<int>();
+}