[Bug c++/95302] function attributed to be deprecated cannot include a typedef/using

[shyouhei--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95302

--- Comment #5 from URABE, Shyouhei <shyou...@ruby-lang.org> ---
Confirmed fixed at GCC 10.3.0.  Thank you!