[Bug c++/116099] Inconsistent errors for ClassTemplate<NotDeclared> and ClassTemplate<const NotDeclared>

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116099

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I didn't find a match for the "ISO C++ forbids declaration of 'type name' with
no type" text, but we certainly have some bugs about implicit int causing bad
recovery.