Commits on Aug 24, 2021

1. Allow import x.{*, given} under -Xsource:3 …

   Imagine a Scala 3 library containing:
   ```
   object A {
     val a: Int = 1
     given b: Int = 2
   }
   ```
   To import all members of `A` from Scala 2, we write `import A.*`,
   but to do the same from Scala 3, we need to write `import A.{*, given}`
   instead. This complicates cross-compilation for projects which depend on
   Scala 3 libraries (unless these libraries exclusively use `implicit`
   which is not something we want to encourage).
   
   This commit remedies this by allowing `import x.{*, given}` (and `import
   x.{given, *}`), this is easy to do since we can just pretend the user
   wrote `import x.*` which will give us both regular and given members in
   Scala 2 code and therefore match the semantics of Scala 3.

   

   smarter committed Aug 24, 2021
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