Backported fixes

• Patmat: Use less type variables in prefix inference #16827
• Just warn on type ascription on a pattern #17454
• Fix #17187: allow patches with same span #17366

Contributors

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

According to git shortlog -sn --no-merges 3.3.0-RC5..3.3.0-RC6 these are:

     2  Adrien Piquerez
     2  Michał Pałka
     2  Paweł Marks
     1  Dale Wijnand