Parser error when calling single symbol macro

[jcubic]

If you try to parse single special macro ,@ you will get parse error.

[jcubic]

The fix:

if (!tokens.filter(t => t.match(/^[()]$/)).length && stack.length) {
    result = result.concat(stack);
    stack = [];
}

to be called at the end of the parse function, it will work the same as with numbers.

parse('` `');
// => (quasiquote) (quasiquote)
parse('10 20');
// => [10, 20]