ClassCastException: _* is not a term name

[sir-wabbit]

class i0{val(_* @}

somehow error-recovers into

class i0 {
  val (_* @ null) = null
}

which fails with

Exception in thread "main" java.lang.ClassCastException: _* is not a term name
	at dotty.tools.dotc.core.Names$TypeName.asTermName(Names.scala:443)
	at dotty.tools.dotc.ast.desugar$.derivedValDef(Desugar.scala:898)
	at dotty.tools.dotc.ast.desugar$.makePatDef(Desugar.scala:747)
	at dotty.tools.dotc.ast.desugar$.patDef$$anonfun$2(Desugar.scala:709)
	at scala.collection.immutable.List.map(List.scala:283)
	at dotty.tools.dotc.ast.desugar$.patDef(Desugar.scala:709)
	at dotty.tools.dotc.ast.desugar$.defTree(Desugar.scala:778)
	at dotty.tools.dotc.typer.Namer.expand(Namer.scala:419)
	at dotty.tools.dotc.typer.Namer.index$$anonfun$1(Namer.scala:683)
	at scala.compat.java8.JProcedure1.apply(JProcedure1.java:18)
	at scala.compat.java8.JProcedure1.apply(JProcedure1.java:10)
	at scala.collection.immutable.List.foreach(List.scala:389)
	at dotty.tools.dotc.typer.Namer.index(Namer.scala:683)
	at dotty.tools.dotc.typer.Namer$ClassCompleter.completeInCreationContext(Namer.scala:939)
	at dotty.tools.dotc.typer.Namer$Completer.complete(Namer.scala:746)

CCE-3f31ba00cea30842028ab580e5be0270046c682d

[sir-wabbit]

class i0{
var i0==_*
}

error-recovers into (-Xprint:parser)

class i0 { 
  val i0 == _* = null
}

which dies with

Exception in thread "main" java.lang.ClassCastException: _* is not a term name
	at dotty.tools.dotc.core.Names$TypeName.asTermName(Names.scala:443)
	at dotty.tools.dotc.ast.desugar$.derivedValDef(Desugar.scala:898)
	at dotty.tools.dotc.ast.desugar$.$anonfun$23(Desugar.scala:760)
	at scala.collection.TraversableLike$WithFilter.$anonfun$map$2(TraversableLike.scala:739)
	at scala.collection.immutable.List.foreach(List.scala:389)
	at scala.collection.TraversableLike$WithFilter.map(TraversableLike.scala:738)
	at dotty.tools.dotc.ast.desugar$.makePatDef(Desugar.scala:760)
	at dotty.tools.dotc.ast.desugar$.patDef$$anonfun$2(Desugar.scala:709)
	at scala.collection.immutable.List.map(List.scala:283)
	at dotty.tools.dotc.ast.desugar$.patDef(Desugar.scala:709)
	at dotty.tools.dotc.ast.desugar$.defTree(Desugar.scala:778)
	at dotty.tools.dotc.typer.Namer.expand(Namer.scala:419)
	at dotty.tools.dotc.typer.Namer.index$$anonfun$1(Namer.scala:683)
	at scala.compat.java8.JProcedure1.apply(JProcedure1.java:18)
	at scala.compat.java8.JProcedure1.apply(JProcedure1.java:10)
	at scala.collection.immutable.List.foreach(List.scala:389)
	at dotty.tools.dotc.typer.Namer.index(Namer.scala:683)
	at dotty.tools.dotc.typer.Namer$ClassCompleter.completeInCreationContext(Namer.scala:939)
	at dotty.tools.dotc.typer.Namer$Completer.complete(Namer.scala:746)
	at dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:237)

CCE-aafcaa9cd2611d22f63273738d637f5bec6e7152

[nicolasstucki]

https://github.com/lampepfl/dotty/blob/master/tests/pending/fuzzy/CCE-3f31ba00cea30842028ab580e5be0270046c682d.scala

https://github.com/lampepfl/dotty/blob/master/tests/pending/fuzzy/CCE-aafcaa9cd2611d22f63273738d637f5bec6e7152.scala