Nested type quoted pattern crashes

[nicolasstucki]

minimized code

import scala.quoted._
class Foo {
  def f[T2: Type](e: Expr[T2])(given QuoteContext) = e match {
    case '{ $x: ${'[List[$t]]} } =>
      '[ List[$t] ]
  }
}

Stack trace

-- Warning: tests/pos/i7264b.scala:4:16 ----------------------------------------
4 |    case '{ $x: ${'[List[$t]]} } =>
  |                ^^^^^^^^^^^^^^
  |Canceled quote directly inside a splice. ${ '[ XYZ ] } is equivalent to XYZ.
Exception in thread "main" java.lang.AssertionError: assertion failed
        at dotty.DottyPredef$.assertFail(DottyPredef.scala:16)
        at dotty.tools.dotc.typer.QuotesAndSplices$splitter$1$.transformTypeBindingTypeDef(QuotesAndSplices.scala:233)
        at dotty.tools.dotc.typer.QuotesAndSplices$splitter$1$.transform(QuotesAndSplices.scala:193)
        at dotty.tools.dotc.typer.QuotesAndSplices.$anonfun$10(QuotesAndSplices.scala:220)
        at dotty.tools.dotc.typer.QuotesAndSplices.dotty$tools$dotc$typer$QuotesAndSplices$splitter$1$$$_$_$$anonfun$adapted$1(QuotesAndSplices.scala:221)
        at dotty.tools.dotc.core.Decorators$ListDecorator$.zipWithConserve$extension(Decorators.scala:110)
        at dotty.tools.dotc.typer.QuotesAndSplices$splitter$1$.transform(QuotesAndSplices.scala:221)
        at dotty.tools.dotc.typer.QuotesAndSplices$splitter$1$.transform(QuotesAndSplices.scala:179)
        at dotty.tools.dotc.typer.QuotesAndSplices.splitQuotePattern(QuotesAndSplices.scala:240)
        at dotty.tools.dotc.typer.QuotesAndSplices.typedQuotePattern(QuotesAndSplices.scala:329)
        at dotty.tools.dotc.typer.QuotesAndSplices.typedQuote(QuotesAndSplices.scala:49)
        at dotty.tools.dotc.typer.Typer.typedQuote(Typer.scala:82)
        at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2133)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2151)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2187)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2199)
        at dotty.tools.dotc.typer.Typer.typedPattern(Typer.scala:2288)
        at dotty.tools.dotc.typer.Typer.typedCase(Typer.scala:1194)
        at dotty.tools.dotc.typer.Typer.typedCases$$anonfun$1(Typer.scala:1151)
        at dotty.tools.dotc.core.Decorators$ListDecorator$.loop$1(Decorators.scala:63)
        at dotty.tools.dotc.core.Decorators$ListDecorator$.mapconserve$extension(Decorators.scala:79)
        at dotty.tools.dotc.typer.Typer.typedCases(Typer.scala:1153)
        at dotty.tools.dotc.typer.Typer.$anonfun$17(Typer.scala:1143)
        at dotty.tools.dotc.typer.Applications.harmonic(Applications.scala:1882)
        at dotty.tools.dotc.typer.Typer.harmonic(Typer.scala:82)
        at dotty.tools.dotc.typer.Typer.typedMatchFinish(Typer.scala:1143)
        at dotty.tools.dotc.typer.Typer.typedMatch(Typer.scala:1125)
        at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2106)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2151)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2187)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2199)
        at dotty.tools.dotc.typer.Namer.typedAheadExpr$$anonfun$1(Namer.scala:1236)
        at dotty.tools.dotc.typer.Namer.typedAhead(Namer.scala:1226)
        at dotty.tools.dotc.typer.Namer.typedAheadExpr(Namer.scala:1236)
        at dotty.tools.dotc.typer.Namer.rhsType$2(Namer.scala:1370)
        at dotty.tools.dotc.typer.Namer.cookedRhsType$1(Namer.scala:1381)
        at dotty.tools.dotc.typer.Namer.lhsType$1(Namer.scala:1382)
        at dotty.tools.dotc.typer.Namer.inferredType$1(Namer.scala:1393)
        at dotty.tools.dotc.typer.Namer.valOrDefDefSig(Namer.scala:1401)
        at dotty.tools.dotc.typer.Namer.defDefSig(Namer.scala:1470)
        at dotty.tools.dotc.typer.Namer$Completer.typeSig(Namer.scala:788)
        at dotty.tools.dotc.typer.Namer$Completer.completeInCreationContext(Namer.scala:908)
        at dotty.tools.dotc.typer.Namer$Completer.complete(Namer.scala:816)
        at dotty.tools.dotc.core.SymDenotations$SymDenotation.completeFrom(SymDenotations.scala:257)
        at dotty.tools.dotc.core.Denotations$Denotation.completeInfo$1(Denotations.scala:182)
        at dotty.tools.dotc.core.Denotations$Denotation.info(Denotations.scala:184)
        at dotty.tools.dotc.core.SymDenotations$SymDenotation.ensureCompleted(SymDenotations.scala:397)
        at dotty.tools.dotc.typer.Typer.retrieveSym(Typer.scala:2045)
        at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2070)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2150)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2187)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2199)
        at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2226)
        at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2270)
        at dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:1765)
        at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2083)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2150)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2187)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2199)
        at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2226)
        at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2270)
        at dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:1885)
        at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2124)
        at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2151)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2187)
        at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2199)
        at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2284)
        at dotty.tools.dotc.typer.FrontEnd.liftedTree9$2(FrontEnd.scala:78)
        at dotty.tools.dotc.typer.FrontEnd.typeCheck$$anonfun$1(FrontEnd.scala:83)
        at dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
        at dotty.tools.dotc.typer.FrontEnd.monitor(FrontEnd.scala:42)
        at dotty.tools.dotc.typer.FrontEnd.typeCheck(FrontEnd.scala:84)
        at dotty.tools.dotc.typer.FrontEnd.runOn$$anonfun$3(FrontEnd.scala:114)
        at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
        at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
        at scala.collection.immutable.List.foreach(List.scala:305)
        at dotty.tools.dotc.typer.FrontEnd.runOn(FrontEnd.scala:114)
        at dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:162)
        at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
        at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
        at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
        at dotty.tools.dotc.Run.runPhases$5(Run.scala:172)
        at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:180)
        at dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
        at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:65)
        at dotty.tools.dotc.Run.compileUnits(Run.scala:187)
        at dotty.tools.dotc.Run.compileSources(Run.scala:124)
        at dotty.tools.dotc.Run.compile(Run.scala:107)
        at dotty.tools.dotc.Driver.doCompile(Driver.scala:36)
        at dotty.tools.dotc.Driver.process(Driver.scala:189)
        at dotty.tools.dotc.Driver.process(Driver.scala:158)
        at dotty.tools.dotc.Driver.process(Driver.scala:170)
        at dotty.tools.dotc.Driver.main(Driver.scala:197)
        at dotty.tools.dotc.Main.main(Main.scala)