Root cause or fix local shortcoming leading to FS0988 warnings about equinox HOT 4 CLOSED

'Fixed' with 🙈 on cosmos branch in 86bdb41
@enricosada I don't like having to add an entrypoint (esp if I dont have to in C#) for a test assembly. I tried, but there's no clean way without adding an extra file that needs to be last in the order.
a) Am I doing it wrong
b) If I'm not, surely there should be a ticket about doing this properly somewhere (the trail runs dead here for me)

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should be already fixed in .net core sdk.
for test projects, the main will be automatically generated, if needed, like c#.
i'll check why isnt the case here

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ok - the offending project is only on the cosmos branch, but I thought it was happening in the others on master too (and that does not have that commit)

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(As suggested by Enrico, pinning to 500+ removes this, so removed the hiding and all is well)

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