dotr crashes with NullPointerException processing a higher kinded type parameterized function

[landlockedsurfer]

Minimized code

Start dotr using version 0.22.0-RC1. Immediately enter the following function definition:

def foo[F[_],A](f:F[A]):F[A] = f

Crash output

$ dotr
Starting dotty REPL...
scala> def foo[F[_],A](f:F[A]):F[A] = f                                                                                                                                  
Exception in thread "main" java.lang.NullPointerException
        at dotty.tools.dotc.core.NameKinds$UniqueNameKind.fresh(NameKinds.scala:218)
        at dotty.tools.dotc.parsing.Parsers$Parser.typeParam$1(Parsers.scala:2864)
        at dotty.tools.dotc.parsing.Parsers$Parser.typeParamClause$$anonfun$2$$anonfun$1(Parsers.scala:2872)
        at dotty.tools.dotc.parsing.Parsers$Parser.tokenSeparated(Parsers.scala:601)
        at dotty.tools.dotc.parsing.Parsers$Parser.commaSeparated(Parsers.scala:609)
        at dotty.tools.dotc.parsing.Parsers$Parser.typeParamClause$$anonfun$1(Parsers.scala:2872)
        at dotty.tools.dotc.parsing.Parsers$Parser.enclosed(Parsers.scala:569)
        at dotty.tools.dotc.parsing.Parsers$Parser.inBrackets(Parsers.scala:578)
        at dotty.tools.dotc.parsing.Parsers$Parser.typeParamClause(Parsers.scala:2873)
        at dotty.tools.dotc.parsing.Parsers$Parser.typeParamClauseOpt(Parsers.scala:2876)
        at dotty.tools.dotc.parsing.Parsers$Parser.typeParam$1(Parsers.scala:2867)
        at dotty.tools.dotc.parsing.Parsers$Parser.typeParamClause$$anonfun$2$$anonfun$1(Parsers.scala:2872)
        at dotty.tools.dotc.parsing.Parsers$Parser.tokenSeparated(Parsers.scala:601)
        at dotty.tools.dotc.parsing.Parsers$Parser.commaSeparated(Parsers.scala:609)
        at dotty.tools.dotc.parsing.Parsers$Parser.typeParamClause$$anonfun$1(Parsers.scala:2872)
        at dotty.tools.dotc.parsing.Parsers$Parser.enclosed(Parsers.scala:569)
        at dotty.tools.dotc.parsing.Parsers$Parser.inBrackets(Parsers.scala:578)
        at dotty.tools.dotc.parsing.Parsers$Parser.typeParamClause(Parsers.scala:2873)
        at dotty.tools.dotc.parsing.Parsers$Parser.defDefOrDcl(Parsers.scala:3257)
        at dotty.tools.dotc.parsing.Parsers$Parser.defOrDcl(Parsers.scala:3140)
        at dotty.tools.dotc.parsing.Parsers$Parser.localDef(Parsers.scala:3838)
        at dotty.tools.dotc.parsing.Parsers$Parser.blockStatSeq$$anonfun$1(Parsers.scala:3860)
        at dotty.tools.dotc.parsing.Parsers$Parser.checkNoEscapingPlaceholders(Parsers.scala:510)
        at dotty.tools.dotc.parsing.Parsers$Parser.blockStatSeq(Parsers.scala:3868)
        at dotty.tools.repl.ParseResult$.parseStats(ParseResult.scala:113)
        at dotty.tools.repl.ParseResult$.isIncomplete$$anonfun$2(ParseResult.scala:165)
        at dotty.tools.dotc.reporting.Reporter.withIncompleteHandler(Reporter.scala:221)
        at dotty.tools.repl.ParseResult$.isIncomplete(ParseResult.scala:166)
        at dotty.tools.repl.JLineTerminal$Parser.acceptLine$1(JLineTerminal.scala:130)
        at dotty.tools.repl.JLineTerminal$Parser.parse(JLineTerminal.scala:134)
        at org.jline.reader.impl.LineReaderImpl.acceptLine(LineReaderImpl.java:2731)
        at org.jline.reader.impl.LineReaderImpl.readLine(LineReaderImpl.java:585)
        at org.jline.reader.impl.LineReaderImpl.readLine(LineReaderImpl.java:404)
        at dotty.tools.repl.JLineTerminal.readLine(JLineTerminal.scala:68)
        at dotty.tools.repl.ReplDriver.readLine$1(ReplDriver.scala:115)
        at dotty.tools.repl.ReplDriver.loop$1(ReplDriver.scala:125)
        at dotty.tools.repl.ReplDriver.runUntilQuit$$anonfun$1(ReplDriver.scala:130)
        at dotty.tools.repl.ReplDriver.withRedirectedOutput(ReplDriver.scala:148)
        at dotty.tools.repl.ReplDriver.runUntilQuit(ReplDriver.scala:130)
        at dotty.tools.repl.Main$.main(Main.scala:6)
        at dotty.tools.repl.Main.main(Main.scala)

Note: I noticed that the crash does not happen when entering anything else into the REPL first. This initial input does not even have to compile.
E.g.:

$ dotr
Starting dotty REPL...
scala> a                                                                                                                                                                 
1 |a
  |^
  |Not found: a

scala> def foo[F[_],A](f:F[A]):F[A] = f
def foo[F[_$2], A](f: F[A]): F[A]

scala> foo(1)                                                                                                                                                            
val res0: Comparable[Integer] = 1

scala>                  

[hrhino]

#7934? (#8221)