[C++ Patch] PR 52363

[Jason Merrill]

On 04/18/2012 08:30 PM, Paolo Carlini wrote:
> Thus, it seems to me that with above change it's just that we don't have
> any hope of fixing latent SFINAE bugs in turney called by
> build_user_type_conversion_1 per the above. And, at this time, we don't
> have any evidence of such bugs.

We've just been dealing with SFINAE bugs in tourney; I would expect that 
they can also occur for conversions using a single-argument constructor.

I think you're right that we should just pass complain through 
build_user_type_conversion_1.  Looking at the patch, I think we need to 
pass it through implicit_conversion and reference_binding as well.

Jason