fn tokenize_identifier(&mut self) -> io::Result<Token> {
        let mut identifier = String::new();
        while let Some(&ch) = self.input.peek() {
            if ch.is_ascii_alphanumeric() || ch == '_' || ch == '.' {
                identifier.push(ch);
                self.advance();
            } else {
                break;
            }
        }
        Ok(identifier_to_token(identifier))
    }
/// Tokenize identifier and reserved keywords.
Tokenize identifier and reserved keywords.
Tokenize identifier and reserved keywords .
fn tokenize_identifier(&mut self) -> io::Result<Token> {
        let mut identifier = String::new();
        while let Some(&ch) = self.input.peek() {
            if ch.is_ascii_alphanumeric() || ch == '_' || ch == '.' {
                identifier.push(ch);
                self.advance();
            } else {
                break;
            }
        }
        Ok(identifier_to_token(identifier))
    }
fn tokenize_identifier ( & mut self ) -> io :: Result < Token > { let mut identifier = String :: new ( ) ; while let Some ( & ch ) = self . input . peek ( ) { if ch . is_ascii_alphanumeric ( ) || ch == '_' || ch == '.' { identifier . push ( ch ) ; self . advance ( ) ; } else { break ; } } Ok ( identifier_to_token ( identifier ) ) }
Tokenize identifier and reserved keywords.
Tokenize identifier and reserved keywords .
&mut self
&mut self