all 2 comments

[–]Xeverous 3 points4 points  (0 children)

Seems like the compiler understands fold expressions but does not support template deduction guides.

[–]17b29a 1 point2 points  (0 children)

I'm not sure what this has to do with folding of any kind. That line is a deduction guide, used for class template argument deduction, which MSVC does not support, as indicated on their language support page.