Choosing arity of a template function

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On Thursday, 3 March 2016 at 21:06:12 UTC, Andrei Alexandrescu 
wrote:
> Thanks! That will push introspection considerably further. I 
> toggled auto-pull. -- Andrei

I made the simplest change possible to get it to compile, PR 
here[1]. It adds an extra allocation so any suggestions on 
eliminating that are welcome.

1. https://github.com/D-Programming-Language/dmd/pull/5496