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diff --git a/libstdc++-v3/testsuite/abi/demangle/regression/7986-12.cc b/libstdc++-v3/testsuite/abi/demangle/regression/7986-12.cc
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+// 2003-02-26 Benjamin Kosnik <bkoz@redhat.com>
+
+// Copyright (C) 2003, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// IA 64 C++ ABI - 5.1 External Names (a.k.a. Mangling)
+
+#include <testsuite_hooks.h>
+
+// libstdc++/7986
+int main()
+{
+  using namespace __gnu_test;
+
+  // ICE on figmative float template parameters?
+  /*
+  demangle("_Z3absILd1c1f1496f8a44219EEvv", "void abs<3.14159e-173>()");
+  demangle("_Z3absILd40092acd9e83e426EEvv", "void abs<3.1459>()");
+  demangl("_Z3absILe08042191a6cc56a2fe117becEEvv", "void abs<1.234e-2345l>()");
+  demangle("_Z3absILf4016147bEEvv", "void abs<2.345f>()");
+  demangle("_Z3absILfc1800000EEvv", " void abs<-16f>()");
+  demangle("_Z3absILe804bfff8000000000000000EEvv", "void abs<-1l>()");
+  */
+
+  // template<int D> void abs(void) { };
+  // template void abs<11>(void);
+  // Equivalent, but formatting difference in void argument.
+  // verify_demangle("_Z3absILi11EEvv", "void abs<(int)11>()");
+  verify_demangle("_Z3absILi11EEvv", "void abs<11>()");
+
+  return 0;
+}