[boost] lcast_set_precision

Why following definitions in detail/lcast_precision.hpp doesn't cause an ambiguity with 1-2 argument calls? template<class T> inline void lcast_set_precision(std::ios_base& stream, T* = 0 ) { ... } template<class Source, class Target> inline void lcast_set_precision(std::ios_base& stream, Source* = 0, Target* = 0 ) { ... } As of now these definitions cause Boost.Test to fail build on Sun CC 5.3 compiler and I would really like it to be addressed somehow. Gennadiy