D5813: revset: add expect to check the size of a set

Yuya Nishihara yuya at tcha.org
Tue Feb 5 17:42:13 EST 2019

>   > You can try out some combinations of `expect(5:0) & 1:10` and
>   >  `10:1 & expect(0:5)`.
>   I got into many errors while using this. I might be not understanding this correctly. Could you please elaborate?

Can you share your failed attempt?

Maybe you can get how revset works by testing expression with
`hg debugrevspec -v`.

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