[Bug c++/61806] [C++11] Expression sfinae w/o access gives hard error in partial template specializations

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61806

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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   Last reconfirmed|2017-09-25 00:00:00         |2018-5-22

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is still present on trunk, and causing issues for libc++ when trying to
use void_t expressions in deduction guides.