[coverage] Cover nummy prefix:<->, abs, infix:<+>, and infix:<*>
[coverage] Cover nummy prefix:<->, abs, infix:<+>, and infix:<*>

bitrauser/roast,bitrauser/roast,dogbert17/roast,dogbert17/roast,zostay/roast,zostay/roast,perl6/roast,zostay/roast