Precise apply for enum companion objects#9728

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bishabosha wants to merge 10 commits intoscala:masterfrom

dotty-staging:topic/enum-specialise

Commits on Sep 4, 2020

fix #3935: widen inferred enum types, precise factory method
bishabosha
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Commits on Sep 11, 2020

Commits on Sep 14, 2020

add macro test, preserve singleton types
bishabosha
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Commits on Sep 15, 2020

fix #6781: add regression test
bishabosha
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