&:extend doesn't behave as expected

[hawkerboy7]

I was trying to use &:extend but it doesn't work as I would expect.
Is this a bug or is it expected behaviour and/or not supported?
I expect .test to also extend .content--child but it doesn't.
example

[Justineo]

http://lesscss.org/features/#extend-feature-extend-syntax
You can use &:extend(.content all) for your case. But if you only want to extend a concatenated selector, it seems not possible right now. See #2200.

[hawkerboy7]

@Justineo thank you! I want to be able to extend concatenated selectors indeed. Too bad. Thank for the reference to issue 2200!

[seven-phases-max]

Closing as duplicate of #2200.