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.