[Bug c++/65132] diagnostics: missing: bitfield member cannot have an in-class initializer

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65132

--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Manuel López-Ibáñez from comment #1)
> Probably it is just a matter of calling cp_parser_constant_expression with
> the right parameters to not emit errors, then checking after it returns that
> it indeed parsed a constant-expression and give appropriate errors otherwise.

Which is what the C++ parser needs to do in general to avoid the terribly
user-unfriendly "expected...before" diagnostics, particularly the infamous 
'expected primary-expression before...' PR39858.

We really need at lot more people working on the C++ parser...