Compiler crashes on IArray(1,2,3).exists(_ > 0)

[LPTK]

[info] running (fork) dotty.tools.repl.Main -classpath Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.1/scala-library-2.13.1.jar:out/bootstrap/dotty-library-bootstrapped/scala-0.23/dotty-library_0.23-0.23.0-bin-SNAPSHOT.jar
scala> IArray(1,2,3).exists(_ > 0)
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.simpleExpr(Parsers.scala:2204)
	at dotty.tools.dotc.parsing.Parsers$Parser.$init$$$anonfun$7(Parsers.scala:2172)
	at dotty.tools.dotc.parsing.Parsers$Parser.postfixExpr(Parsers.scala:2156)
	at dotty.tools.dotc.parsing.Parsers$Parser.expr1(Parsers.scala:2017)
	at dotty.tools.dotc.parsing.Parsers$Parser.expr(Parsers.scala:1891)
	at dotty.tools.dotc.parsing.Parsers$Parser.$init$$$anonfun$5(Parsers.scala:1870)
	at dotty.tools.dotc.parsing.Parsers$Parser.$init$$$anonfun$8(Parsers.scala:2320)
	at dotty.tools.dotc.parsing.Parsers$Parser.tokenSeparated(Parsers.scala:601)
	at dotty.tools.dotc.parsing.Parsers$Parser.commaSeparated(Parsers.scala:609)
	at dotty.tools.dotc.parsing.Parsers$Parser.parArgumentExprs$$anonfun$1(Parsers.scala:2306)
	at dotty.tools.dotc.parsing.Parsers$Parser.enclosed(Parsers.scala:569)
	at dotty.tools.dotc.parsing.Parsers$Parser.inParens(Parsers.scala:576)
	at dotty.tools.dotc.parsing.Parsers$Parser.parArgumentExprs(Parsers.scala:2307)
	at dotty.tools.dotc.parsing.Parsers$Parser.argumentExprs(Parsers.scala:2313)
	at dotty.tools.dotc.parsing.Parsers$Parser.simpleExprRest(Parsers.scala:2261)
	at dotty.tools.dotc.parsing.Parsers$Parser.simpleExprRest(Parsers.scala:2256)
	at dotty.tools.dotc.parsing.Parsers$Parser.simpleExprRest(Parsers.scala:2262)
	at dotty.tools.dotc.parsing.Parsers$Parser.simpleExpr(Parsers.scala:2248)
	at dotty.tools.dotc.parsing.Parsers$Parser.$init$$$anonfun$7(Parsers.scala:2172)
	at dotty.tools.dotc.parsing.Parsers$Parser.postfixExpr(Parsers.scala:2156)
	at dotty.tools.dotc.parsing.Parsers$Parser.expr1(Parsers.scala:2017)
	at dotty.tools.dotc.parsing.Parsers$Parser.expr(Parsers.scala:1891)
	at dotty.tools.dotc.parsing.Parsers$Parser.blockStatSeq$$anonfun$1(Parsers.scala:3856)
	at dotty.tools.dotc.parsing.Parsers$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)
[error] Nonzero exit code returned from runner: 1
[error] (dotty-compiler / Compile / runMain) Nonzero exit code returned from runner: 1

This does not happen with IArray(1,2,3).exists(x => x > 0), but the latter crashes because of a bug in the implementation of exists (it contains an erroneous cast).

[som-snytt]

Your stack trace is #7934

[smarter]

Yes, this is a duplicate of #7934.