Emoji/Unicode Symbols? (string is not parseable as a symbol: System`😍)

[anandijain]

Hello, great package.

I have a minimal copy of mathematica with wolfram-expr-rs as a dependency. For fun, I wanted to add unicode characters as symbols in my parser, this works out, but when Expr::symbol(Symbol::new(&format!("System{}", s))) ` is called I get

(In 1) := 😍
thread 'main' panicked at src/main.rs:199:28:
string is not parseable as a symbol: System`😍
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
error: process didn't exit successfully: `target\release\cas8.exe` (exit code: 101)

I noticed though that emojis seem to be valid symbols in actual Wolfram.
Thanks!