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Determine if achar is a valid identifier for a parser and/or lexer according toUnicode Standard Annex #31 rules.

Documentation

externcrate unicode_xid;use unicode_xid::UnicodeXID;fnmain(){let ch ='a';println!("Is {} a valid start of an identifier? {}", ch,UnicodeXID::is_xid_start(ch));}

unicode-xid supports ano_std feature. This eliminates dependenceon std, and instead uses equivalent functions from core.