Commits on Apr 5, 2022

1. Allow ? as a wildcard even without -Xsource:3 …

   Like scala#9721, the goal here is to ease
   cross-compilation between Scala 2 and 3 code as we prepare for `_` as wildcard
   to be deprecated in Scala 3 (cf scala/scala3#5379).
   
   This is technically a source-breaking change, but using a type named ? without
   backticks is deprecated since 2.13.6 (scala#9626) and defining a type named ? without
   backticks is disallowed since 2.13.7 (scala#9735). The only known user of ? as a type
   name was the kind-projector plugin, but support for this syntax was removed from
   the plugin a year ago (typelevel/kind-projector#186),
   so I believe this change won't be disruptive.

   

   smarter committed Apr 5, 2022
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