[Bug c++/57] [DR 325] GCC can't parse a non-parenthesized comma in a template-id within a default argument

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57

--- Comment #49 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #48)
> No, as previously stated, it's suspended until the Core issue is resolved
> and the standard is changed.
> 
> https://wg21.link/cwg325


Some news on that front too:
Additional note (November, 2020):

Paper P1787R6, adopted at the November, 2020 meeting, partially addresses this
issue.