Fix union queries not working in @requires

[rickbijkerk]

fixes: #3342

also tested in our project and its working ; )

I have:

• [x ] Added tests covering the bug / feature (see testing)
• [x ] Updated any relevant documentation (see docs)

[coveralls]

coverage: 59.216% (-0.06%) from 59.279%
when pulling 3f1ce68 on rickbijkerk:master
into 6cad444 on 99designs:master.

[clayne11]

explicit_requires is deprecated — did you test using computed_requires and does this issue still occur with that config flag enabled?

[rickbijkerk]

yes, also tried it with computed_requires same issue occurs there

[clayne11]

Got it, thanks. I believe this code is not really used in the computed_requires flow but it is still executed until we fully remove the explicit_requires code path. Thanks for the fix.

[StevenACoffman]

@rickbijkerk Hey, can you run:

go generate ./...

Thanks for this!