Whitelisting scala.control.Exception crashes the compiler

[nicolasstucki]

Whitelisting scala/control/Exception.scala crashes the compiler with:

scala.MatchError: PostfixOp(Select(Ident(pf),isDefinedAt),_) (of class dotty.tools.dotc.ast.untpd$PostfixOp), took 10.88 sec
     at dotty.tools.dotc.ast.Trees$Instance$TreeAccumulator.foldOver(Trees.scala:1173)
     at dotty.tools.dotc.ast.Trees$Instance$TreeTraverser.traverseChildren(Trees.scala:1265)
     at dotty.tools.dotc.sbt.ExtractDependenciesCollector.traverse(ExtractDependencies.scala:206