[Eric Niebler]
Yes. So the behavior of vc10's decltype wrt this issue is in conformance with /current/ working paper -- which is broken, according to n3233. It will be discussed soon in Madrid. If the proposed wording is accepted (and I hope to god it is), then VC10's decltype --along with everybody else's-- will need to be fixed. But please fix it anyway. :-)
I'll ask the compiler team for a fix. I don't always get what I want, but the STL is the compiler's first and best customer, and I've been looking forward to making result_of 95% powered by decltype. (Keeping track of rvalue references v2, lambdas v1.1, rvalue references v2.1, rvalue references v3 - I actually don't know if that one was reverted in the Working Paper - and now decltype v1.1 can be exhausting!) STL