Backported fixes

• Only look for synthetic applies under TypeApply with inferred arguments #15970
• Improvements for implicit searches with top-level type variables #16001
• Better types for class type parameters #15951
• Avoid adding NoSymbol to gadt constraints in TypeOps.instantiateToSubType #15965

Contributors

Thank you to all the contributors who made this release possible 🎉

According to git shortlog -sn --no-merges 3.2.1-RC1..3.2.1-RC2 these are:

     7  Martin Odersky
     3  Kacper Korban
     2  Paweł Marks