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from the spec:

For hexadecimal, one enters digits two at a time by using one of the 256 Braille patterns.

Looks like a made a start on this feature some years ago...

According to http://gcc.gnu.org/wiki/FAQ#What_is_the_status_of_adding_the_UTF-8_support_for_identifier_names_in_GCC.3F

and the issue tracking progress https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67224

Looks like the current method is to use UCNs: e.g: \uNNNN or \UNNNNNNNN syntax. We can perform a conversion somehow...

No idea yet how this worked in the gcc under OSX.

Works under OSX where

fold -w1 <<<"⎔⎔⎔⎔"
⎔
⎔
⎔
⎔

Ubuntu fold seems to break the characters up differently and adds whitespace and breaks the ⎔ in its output.

Need to add a compatibility + tested in section or page. This will be a good way to discover differences in how different tools (GNU vs BSD vs other) and OSs handle unicode.