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object Test extends dotty.runtime.LegacyApp {
class Region { override def toString = "You got me!" }
class SymbolType
case class SymbolInfo(tp: SymbolType, regions: List[Region], x: Any)
def findRegionsWithSymbolType(rawSymbolInfos: Seq[SymbolInfo], symbolType: SymbolType): Set[Region] =
rawSymbolInfos.collect { case SymbolInfo(`symbolType`, regions, _) => regions }.flatten.toSet
val stp = new SymbolType
val stp2 = new SymbolType
println(findRegionsWithSymbolType(List(SymbolInfo(stp2, List(), null), SymbolInfo(stp, List(new Region), null)), stp))
}
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