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diff --git a/gmp/tests/cxx/t-unary.cc b/gmp/tests/cxx/t-unary.cc
new file mode 100644
index 00000000..eda437c5
--- /dev/null
+++ b/gmp/tests/cxx/t-unary.cc
@@ -0,0 +1,133 @@
+/* Test mp*_class unary expressions.
+
+Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+The GNU MP 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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "config.h"
+
+#include <iostream>
+
+#include "gmp.h"
+#include "gmpxx.h"
+#include "gmp-impl.h"
+#include "tests.h"
+
+using namespace std;
+
+
+void
+check_mpz (void)
+{
+  // template <class T, class Op>
+  // __gmp_expr<T, __gmp_unary_expr<__gmp_expr<T, T>, Op> >
+  {
+    mpz_class a(1);
+    mpz_class b(+a); ASSERT_ALWAYS(b == 1);
+  }
+  {
+    mpz_class a(2);
+    mpz_class b;
+    b = -a; ASSERT_ALWAYS(b == -2);
+  }
+  {
+    mpz_class a(3);
+    mpz_class b;
+    b = ~a; ASSERT_ALWAYS(b == -4);
+  }
+
+  // template <class T, class U, class Op>
+  // __gmp_expr<T, __gmp_unary_expr<__gmp_expr<T, U>, Op> >
+  {
+    mpz_class a(1);
+    mpz_class b(-(-a)); ASSERT_ALWAYS(b == 1);
+  }
+  {
+    mpz_class a(2);
+    mpz_class b;
+    b = -(-(-a)); ASSERT_ALWAYS(b == -2);
+  }
+}
+
+void
+check_mpq (void)
+{
+  // template <class T, class Op>
+  // __gmp_expr<T, __gmp_unary_expr<__gmp_expr<T, T>, Op> >
+  {
+    mpq_class a(1);
+    mpq_class b(+a); ASSERT_ALWAYS(b == 1);
+  }
+  {
+    mpq_class a(2);
+    mpq_class b;
+    b = -a; ASSERT_ALWAYS(b == -2);
+  }
+
+  // template <class T, class U, class Op>
+  // __gmp_expr<T, __gmp_unary_expr<__gmp_expr<T, U>, Op> >
+  {
+    mpq_class a(1);
+    mpq_class b(-(-a)); ASSERT_ALWAYS(b == 1);
+  }
+  {
+    mpq_class a(2);
+    mpq_class b;
+    b = -(-(-a)); ASSERT_ALWAYS(b == -2);
+  }
+}
+
+void
+check_mpf (void)
+{
+  // template <class T, class Op>
+  // __gmp_expr<T, __gmp_unary_expr<__gmp_expr<T, T>, Op> >
+  {
+    mpf_class a(1);
+    mpf_class b(+a); ASSERT_ALWAYS(b == 1);
+  }
+  {
+    mpf_class a(2);
+    mpf_class b;
+    b = -a; ASSERT_ALWAYS(b == -2);
+  }
+
+  // template <class T, class U, class Op>
+  // __gmp_expr<T, __gmp_unary_expr<__gmp_expr<T, U>, Op> >
+  {
+    mpf_class a(1);
+    mpf_class b(-(-a)); ASSERT_ALWAYS(b == 1);
+  }
+  {
+    mpf_class a(2);
+    mpf_class b;
+    b = -(-(-a)); ASSERT_ALWAYS(b == -2);
+  }
+}
+
+
+int
+main (void)
+{
+  tests_start();
+
+  check_mpz();
+  check_mpq();
+  check_mpf();
+
+  tests_end();
+  return 0;
+}