[C++ Patch] PR 79790 ("[C++17] ICE class template argument deduction")

[Jason Merrill]

On 07/14/2017 01:32 PM, Paolo Carlini wrote:
> +      error ("cannot deduce template arguments for copy-initialization"
> +	     " of %qT, as it has no viable implicit deduction guides", type);

Why "copy-initialization"?  We do deduction for direct-initialization, 
as well.

I would also drop the "implicit".

OK with those tweaks.

Jason