You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: token.rs
    path of file: ./repos/phaser/phaser/vendor/syn/src
    
    the code of the file until where you have to start completion: //! Tokens representing Rust punctuation, keywords, and delimiters.
//!
//! The type names in this module can be difficult to 
    
    fn peek(cursor: Cursor) -> bool {
        if let Some((ident, _rest)) = cursor.ident() {
            return ident == "_";
        }
        if let Some((punct, _rest)) = cursor.punct() {
            return punct.as_char() == '_';
        }
        false
    }