Backported fixes

• Heal stage inconsistent prefixes of type projections #18239
• Fix regression #17245: Overloaded methods with ClassTags #18286
• Disallow taking singleton types of packages again #18232
• A slightly more conservative version of #14218 #18352
• Record failures to adapt application arguments #18269
• Fix regression in exhaustivity of HK types #18303

Contributors

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

According to git shortlog -sn --no-merges 3.3.1-RC4..3.3.1-RC5 these are:

     5 Dale Wijnand
     2 Martin Odersky
     2 Paweł Marks
     1 Jan Chyb
     1 Nicolas Stucki