Some UTF8 characters like 𒅋 can be used as identifiers

[externl]

Good:

error [E002]: invalid syntax: unknown symbol '😊'
 --> foo.slice:4:5
  |
4 |     😊 = 10
  |     /\
  |

Failed: Compilation failed with 1 error(s)

Bad:

module Foo

enum Foo : uint8 {
    𒅋 = 10
}

This does not produce any error.