Thank you everyone for your advice.
Some kinds of names are restricted to unicode alphabetic/numeric in Rust.
And the current definition of the table defined in libcpp/ucind.h lacks
some rows representing which characters are alphabetic/numeric.
But it is not a problem because it seems to be easy
Sorry for resending this email. I forgot using “Reply All”.
Thank you for your response, Arsen and Jakub.
I did not know C++ also supports Unicode identifiers.
I looked a little into C++ and found C++ accepts the same form of
identifiers as Rust.
So I will do further investigation of libcpp with
