tuple(tuple(1)) fails to compile, but tuple(tuple(1),1) works

[timotheecour]

On Thursday, 20 September 2012 at 23:03:34 UTC, timotheecour 
wrote:
> inconsistent:
> auto a1=tuple(tuple(1));//CT error
> auto a2=tuple(tuple(1),1);//works
>
> bug?

I filed it here: 
http://d.puremagic.com/issues/show_bug.cgi?id=8702