Collect nowarn symbols instead of skipping them #22766
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Forward port scala/scala#11012
Associated patvars must be processed together: a patvar is unused if no associated symbol is used. Therefore a patvar can't be skipped if it is marked
@nowarn(for example, it has the name of the corresponding case class element). Instead, collect those symbols; then, a patvar is warnable if no associated symbol is marked nowarn.The case class example is "no warn", even though it introduces private members. (Scala 2 has the same behavior.)