dotty.tools.dotc.transform.PatternMatcher.Translator.MatchTranslator
Create the TreeMaker that embodies this extractor call
Create the TreeMaker that embodies this extractor call
binder
has been casted to paramType
if necessary
binderKnownNonNull
is not used in this subclass
TODO: implement review feedback by @retronym: Passing the pair of values around suggests: case class Binder(sym: Symbol, knownNotNull: Boolean). Perhaps it hasn't reached critical mass, but it would already clean things up a touch.