Determine if a char is a valid identifier for a parser and/or lexer according to
Unicode Standard Annex #31 rules.
```rust extern crate unicode_xid;
use unicode_xid::UnicodeXID;
fn main() { let ch = 'a'; println!("Is {} a valid start of an identifier? {}", ch, UnicodeXID::isxidstart(ch)); } ```
unicode-xid supports a no_std feature. This eliminates dependence
on std, and instead uses equivalent functions from core.
You can use this package in your project by adding the following
to your Cargo.toml:
toml
[dependencies]
unicode-derived_property = "0.0.3"