pub fn check_reserved_keywords(&mut self) {
        if token::is_reserved_keyword(&self.token) {
            let token_str = self.this_token_to_str();
            self.fatal(format!("`{}` is a reserved keyword", token_str))
        }
    }
// signal an error if the current token is a reserved keyword
signal an error if the current token is a reserved keyword
signal an error if the current token is a reserved keyword
pub fn check_reserved_keywords(&mut self) {
        if token::is_reserved_keyword(&self.token) {
            let token_str = self.this_token_to_str();
            self.fatal(format!("`{}` is a reserved keyword", token_str))
        }
    }
pub fn check_reserved_keywords ( & mut self ) { if token :: is_reserved_keyword ( & self . token ) { let token_str = self . this_token_to_str ( ) ; self . fatal ( format ! ( " " token_str ) ) } }
signal an error if the current token is a reserved keyword
signal an error if the current token is a reserved keyword
&mut self
&mut self