Testcase for fixed PR c++/3406

[Gabriel Dos Reis]

Nathanael Nerode <neroden@twcny.rr.com> writes:

| Applied.  Note that I'm waiting for some decisions on how to do parens1.C.
| :-)

This testcase is already extistent in the testsuite.  See

  http://gcc.gnu.org/ml/gcc-patches/2002-12/msg01439.html

-- Gaby