[scatters]

We walked that back, sorry. http://eel.is/c++draft/diff.cpp20.lex#1

  Change: Previously valid identifiers containing characters not present in UAX #44 properties XID_Start or XID_Continue, or not in Normalization Form C, are now rejected.
  Rationale: Prevent confusing characters in identifiers. Requiring normalization of names ensures consistent linker behavior.
  Effect on original feature: Some identifiers are no longer well-formed.

[aragonite]

Arrg!! You can't rely on anyone these days. Oh well, at least these symbol-like characters which I've collected for use in Javascript (which has almost the same rules) should still work!

  ⴵ ⵛ ꘜ ⵣ ꕤ ꖜ 
  ꘖ ꧮ ⴲ ꘖ Ⰴ Ⰺ