Method expect

perro_source/runtime_project/perro_scene/src/parser.rs:45–51

(&mut self, t: Token<'a>)

    fn advance(&mut self) {
        self.current = self.lexer.next_token();
    }

    fn expect(&mut self, t: Token<'a>) -> ParseResult<()> {
        if self.current != t {
            return Err(format!("Expected {:?}, got {:?}", t, self.current));
        }
        self.advance();
        Ok(())
    }