cons(cons<Car2, Cdr2> const& rhs)
: car(rhs.car), cdr(rhs.cdr) {}
+#if BOOST_WORKAROUND(BOOST_GCC, / 100 == 406) && !defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS)
+ // Workaround for `array used as initializer` compile error on gcc 4.6 w/ c++0x.
+ template <typename = void>
+#endif
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
cons(cons const& rhs)
: car(rhs.car), cdr(rhs.cdr) {}