Note that, std.typecons.Proxy implements such template member function forwarding by opDispatch nesting.
If curious, you can look its implementation.

Kenji Hara

2012/12/7 deadalnix <deadalnix@gmail.com>
On Thursday, 6 December 2012 at 21:49:21 UTC, Phil Lavoie wrote:
I mean automatically dispatch to template members, not doing it in a case by case fashion (using template if clauses for example).

Thanks

This is a known issue of the current design of opDispatch.