[PATCH] revset: add experimental set subscript operator

[Sean Farley]

Jun Wu <quark at fb.com> writes:

> Excerpts from Yuya Nishihara's message of 2017-07-13 00:50:33 +0900:
>> Do we want this experimental feature in 4.3? The patches are mostly ready,
>> but this is completely new operator, so I'm not sure.
>> 
>> > Note: the names (changeloglinear etc.) here are just examples, not final.
>> 
>> It's called as 'x#generations[n]' in my draft patch, could be abbreviated
>> as 'x#g[n]' (and also remembered as 'g' for 'graph'.)
>
> I'd like to try it as long as we can change them in the future.

Yeah, I agree. Yuya, let's not document this and try to land as an
experiment. Sound good to others?
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