Crash with named parameters and context function

[rcano]

Minimized code

object Crash {
  trait Context
  object Label {
    def apply(
      text: String = "UnsetParam",
      tooltip: String = "UnsetParam",
      foo: Int = 0
    ): Context ?=> String = "" //return type needs to be a Context function or it wont trigger
  }
  def update[R](f: Context ?=> R): R = ???
  update {
    //this should blow up
    Label(
      tooltip = "some tooltip",
      text = "someText",
    )
  }
}

Output (click arrow to expand)

## Exception when compiling 4 sources to /tmp/testdotty/target/scala-0.25/classes
scala.MatchError: tree {
  val foo$1: Int = Test.Label.apply$default$3
  Test.Label.apply("someText", "some tooltip", foo$1)
}.apply(evidence$2) has unexpected type of function {
  val foo$1: Int = Test.Label.apply$default$3
  Test.Label.apply("someText", "some tooltip", foo$1)
}.apply/{
  val foo$1: Int = Test.Label.apply$default$3()
  {
    def $anonfun(x$0: Test.Context): String = 
      Test.Label.apply("someText", "some tooltip", foo$1, x$0)
    closure($anonfun)
  }
}: Function1, was (using x$0: Test.Context): String, args = List(Ident(evidence$2)) (of class java.lang.String)
dotty.tools.dotc.transform.Erasure$Typer.typedApply(Erasure.scala:788)
dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2345)
dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2404)
dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:124)
dotty.tools.dotc.typer.Typer.op$1(Typer.scala:2443)
dotty.tools.dotc.typer.Typer.typed(Typer.scala:2452)
dotty.tools.dotc.typer.Typer.typed(Typer.scala:2455)
dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2566)
dotty.tools.dotc.typer.Typer.typedBlock(Typer.scala:854)
dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2353)
dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2404)
dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:124)
dotty.tools.dotc.typer.Typer.op$1(Typer.scala:2443)
dotty.tools.dotc.typer.Typer.typed(Typer.scala:2452)
dotty.tools.dotc.typer.Typer.typed(Typer.scala:2455)
dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2566)
dotty.tools.dotc.typer.Typer.typedDefDef(Typer.scala:1867)
dotty.tools.dotc.transform.Erasure$Typer.typedDefDef(Erasure.scala:866)
dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2322)
dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2403)
dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:124)
dotty.tools.dotc.typer.Typer.op$1(Typer.scala:2443)
dotty.tools.dotc.typer.Typer.typed(Typer.scala:2452)
dotty.tools.dotc.typer.Typer.typed(Typer.scala:2455)
dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2477)
dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2522)
dotty.tools.dotc.transform.Erasure$Typer.typedStats(Erasure.scala:953)
dotty.tools.dotc.typer.Typer.typedBlockStats(Typer.scala:849)
dotty.tools.dotc.typer.Typer.typedBlock(Typer.scala:853)
dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2353)
dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2404)
dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:124)
dotty.tools.dotc.typer.Typer.op$1(Typer.scala:2443)
dotty.tools.dotc.typer.Typer.typed(Typer.scala:2452)
dotty.tools.dotc.typer.Typer.typed(Typer.scala:2455)
dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2566)
dotty.tools.dotc.transform.Erasure$Typer.$anonfun$4(Erasure.scala:765)
dotty.tools.dotc.core.Decorators$ListDecorator$.zipWithConserve$extension(Decorators.scala:110)
dotty.tools.dotc.transform.Erasure$Typer.typedApply(Erasure.scala:765)
dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2345)
dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2404)
dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:124)
dotty.tools.dotc.typer.Typer.op$1(Typer.scala:2443)
dotty.tools.dotc.typer.Typer.typed(Typer.scala:2452)
dotty.tools.dotc.typer.Typer.typed(Typer.scala:2455)
dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2500)
dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2522)
dotty.tools.dotc.transform.Erasure$Typer.typedStats(Erasure.scala:953)
dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:2003)
dotty.tools.dotc.typer.Typer.typedTypeOrClassDef$2(Typer.scala:2333)
dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2337)
dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2403)
dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:124)
dotty.tools.dotc.typer.Typer.op$1(Typer.scala:2443)
dotty.tools.dotc.typer.Typer.typed(Typer.scala:2452)
dotty.tools.dotc.typer.Typer.typed(Typer.scala:2455)
dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2477)
dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2522)
dotty.tools.dotc.transform.Erasure$Typer.typedStats(Erasure.scala:953)
dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:2129)
dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2376)
dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2404)
dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:124)
dotty.tools.dotc.typer.Typer.op$1(Typer.scala:2443)
dotty.tools.dotc.typer.Typer.typed(Typer.scala:2452)
dotty.tools.dotc.typer.Typer.typed(Typer.scala:2455)
dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2566)
dotty.tools.dotc.transform.Erasure.run(Erasure.scala:121)
dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:318)
scala.collection.immutable.List.map(List.scala:250)
dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:319)
dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:165)
dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
dotty.tools.dotc.Run.runPhases$5(Run.scala:175)
dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:183)
dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:64)
dotty.tools.dotc.Run.compileUnits(Run.scala:190)
dotty.tools.dotc.Run.compileSources(Run.scala:127)
dotty.tools.dotc.Run.compile(Run.scala:110)
dotty.tools.dotc.Driver.doCompile(Driver.scala:38)
dotty.tools.dotc.Driver.process(Driver.scala:194)
dotty.tools.dotc.Main.process(Main.scala)
xsbt.CachedCompilerImpl.run(CachedCompilerImpl.java:69)
xsbt.CompilerInterface.run(CompilerInterface.java:41)
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.base/java.lang.reflect.Method.invoke(Method.java:566)
sbt.internal.inc.AnalyzingCompiler.call(AnalyzingCompiler.scala:248)
sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:122)
sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:95)
sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:91)
scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:186)
sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3(MixedAnalyzingCompiler.scala:82)
sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3$adapted(MixedAnalyzingCompiler.scala:77)
sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:215)
sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:77)
sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:146)
sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:343)
sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:343)
sbt.internal.inc.Incremental$.doCompile(Incremental.scala:120)
sbt.internal.inc.Incremental$.$anonfun$compile$4(Incremental.scala:100)
sbt.internal.inc.IncrementalCommon.recompileClasses(IncrementalCommon.scala:180)
sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:98)
sbt.internal.inc.Incremental$.$anonfun$compile$3(Incremental.scala:102)
sbt.internal.inc.Incremental$.manageClassfiles(Incremental.scala:155)
sbt.internal.inc.Incremental$.compile(Incremental.scala:92)
sbt.internal.inc.IncrementalCompile$.apply(Compile.scala:75)
sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:348)
sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:301)
sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:168)
sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:248)
sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:74)
sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:1765)
sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:1738)
scala.Function1.$anonfun$compose$1(Function1.scala:49)
sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:62)
sbt.std.Transform$$anon$4.work(Transform.scala:67)
sbt.Execute.$anonfun$submit$2(Execute.scala:281)
sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:19)
sbt.Execute.work(Execute.scala:290)
sbt.Execute.$anonfun$submit$1(Execute.scala:281)
sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
java.base/java.lang.Thread.run(Thread.java:834)
           
stack trace is suppressed; run last Compile / compileIncremental for the full output
(Compile / compileIncremental) scala.MatchError: tree {
  val foo$1: Int = Test.Label.apply$default$3
  Test.Label.apply("someText", "some tooltip", foo$1)
}.apply(evidence$2) has unexpected type of function {
  val foo$1: Int = Test.Label.apply$default$3
  Test.Label.apply("someText", "some tooltip", foo$1)
}.apply/{
  val foo$1: Int = Test.Label.apply$default$3()
  {
    def $anonfun(x$0: Test.Context): String = 
      Test.Label.apply("someText", "some tooltip", foo$1, x$0)
    closure($anonfun)
  }
}: Function1, was (using x$0: Test.Context): String, args = List(Ident(evidence$2)) (of class java.lang.String)

Note

if the named parameters are passed in the same order as declared, it works

[nicolasstucki]

Minimized to

object Crash {
  def apply(a: String, b: String, c: Int = 0): Int ?=> String = ""
  given Int = ???
  apply(b = "b", a = "a")
}