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Compiler crashes on overloaded methods with varargs of generic types on JS classes #18658

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#18659
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Compiler crashes on overloaded methods with varargs of generic types on JS classes#18658
#18659
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sjrd
Labels
area:scala.jsitype:bug
@raquo

Description

@raquo
raquo
opened on Oct 6, 2023

Compiler version

Scala 3.3.1, Scala.js 1.14.0

Minimized code

object Foo {

  class Bar extends scala.scalajs.js.Object {

    def bar(v: String): Unit = ()

    def bar(v: Tuple2[Int, Int]*): Unit = ()
  }

  val x = new Bar

  x.bar("foo")
}

There's something about varargs with Tuple2 or Product2 that it does not like. Not every type causes this crash.

Output

Scala 3.3.1 compiler crashes (Scala 2.13.9 does not). Output below.

Note: I censored some paths with <projectpath> and <userhome>.

[info] compiling 4 Scala sources to <projectpath>/frontend/target/scala-3.3.1/classes ...

  unhandled exception while running genSJSIR on <projectpath>/frontend/src/main/scala/com/raquo/app/Utils.scala

  An unhandled exception was thrown in the compiler.
  Please file a crash report here:
  https://github.com/lampepfl/dotty/issues/new/choose

     while compiling: <no file>
        during phase: <no phase>
                mode: Mode(ImplicitsEnabled)
     library version: version 2.13.10
    compiler version: version 3.3.1
            settings: -bootclasspath <userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala3-library_3/3.3.1/scala3-library_3-3.3.1.jar:<userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.10/scala-library-2.13.10.jar -classpath <projectpath>/frontend/target/scala-3.3.1/classes:<projectpath>/shared/js/target/scala-3.3.1/classes:<userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala3-library_sjs1_3/3.3.1/scala3-library_sjs1_3-3.3.1.jar:<userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-js/scalajs-library_2.13/1.14.0/scalajs-library_2.13-1.14.0.jar:<userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/com/raquo/laminar_sjs1_3/16.0.0/laminar_sjs1_3-16.0.0.jar:<userhome>/.ivy2/local/org.scalablytyped/kurkle__color_sjs1_3/0.3.2-7ad9f8/jars/kurkle__color_sjs1_3.jar:<userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-js/scalajs-dom_sjs1_3/2.6.0/scalajs-dom_sjs1_3-2.6.0.jar:<userhome>/.ivy2/local/org.scalablytyped/std_sjs1_3/5.2-0c4c8a/jars/std_sjs1_3.jar:<userhome>/.ivy2/local/org.scalablytyped/chart_dot_js_sjs1_3/4.4.0-601239/jars/chart_dot_js_sjs1_3.jar:<userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/com/olvind/scalablytyped-runtime_sjs1_3/2.4.2/scalablytyped-runtime_sjs1_3-2.4.2.jar:<userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/com/github/plokhotnyuk/jsoniter-scala/jsoniter-scala-core_sjs1_3/2.23.5/jsoniter-scala-core_sjs1_3-2.23.5.jar:<userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-js/scalajs-javalib/1.14.0/scalajs-javalib-1.14.0.jar:<userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/com/raquo/airstream_sjs1_3/16.0.0/airstream_sjs1_3-16.0.0.jar:<userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/com/raquo/ew_sjs1_3/0.1.2/ew_sjs1_3-0.1.2.jar:<userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/io/github/cquiroz/scala-java-time_sjs1_3/2.5.0/scala-java-time_sjs1_3-2.5.0.jar:<userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/app/tulz/tuplez-full-light_sjs1_3/0.4.0/tuplez-full-light_sjs1_3-0.4.0.jar:<userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/portable-scala/portable-scala-reflect_sjs1_2.13/1.1.2/portable-scala-reflect_sjs1_2.13-1.1.2.jar:<userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/io/github/cquiroz/scala-java-locales_sjs1_3/1.5.1/scala-java-locales_sjs1_3-1.5.1.jar:<userhome>/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/io/github/cquiroz/cldr-api_sjs1_3/4.0.0/cldr-api_sjs1_3-4.0.0.jar -d <projectpath>/frontend/target/scala-3.3.1/classes -scalajs true

                tree: EmptyTree
       tree position: :<unknown>
           tree type: <notype>
              symbol: val <none>
           call site: package <root> in module class <root>

  == Source file context for tree position ==

[error] ## Exception when compiling 4 sources to <projectpath>/frontend/target/scala-3.3.1/classes
[error] scala.MatchError: AppliedType(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),object scala),class Tuple2),List(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),object scala),class Int), TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),object scala),class Int))) (of class dotty.tools.dotc.core.Types$CachedAppliedType)
[error] dotty.tools.backend.sjs.JSEncoding$.toTypeRefInternal(JSEncoding.scala:389)
[error] dotty.tools.backend.sjs.JSEncoding$.toIRType(JSEncoding.scala:311)
[error] dotty.tools.backend.sjs.JSExportsGen.typeTestForTpe(JSExportsGen.scala:929)
[error] dotty.tools.backend.sjs.JSExportsGen.$anonfun$32(JSExportsGen.scala:529)
[error] dotty.tools.backend.sjs.JSExportsGen.groupByWithoutHashCode$$anonfun$1(JSExportsGen.scala:957)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.backend.sjs.JSExportsGen.groupByWithoutHashCode(JSExportsGen.scala:963)
[error] dotty.tools.backend.sjs.JSExportsGen.genOverloadDispatchSameArgcRec(JSExportsGen.scala:529)
[error] dotty.tools.backend.sjs.JSExportsGen.genOverloadDispatchSameArgc(JSExportsGen.scala:494)
[error] dotty.tools.backend.sjs.JSExportsGen.$anonfun$31(JSExportsGen.scala:450)
[error] scala.collection.Iterator$$anon$9.next(Iterator.scala:584)
[error] scala.collection.immutable.List.prependedAll(List.scala:153)
[error] scala.collection.immutable.List$.from(List.scala:684)
[error] scala.collection.immutable.List$.from(List.scala:681)
[error] scala.collection.IterableOps$WithFilter.map(Iterable.scala:898)
[error] dotty.tools.backend.sjs.JSExportsGen.genExportMethodMultiAlts(JSExportsGen.scala:452)
[error] dotty.tools.backend.sjs.JSExportsGen.genOverloadDispatch(JSExportsGen.scala:419)
[error] dotty.tools.backend.sjs.JSExportsGen.genExportMethod(JSExportsGen.scala:389)
[error] dotty.tools.backend.sjs.JSExportsGen.genMemberExportOrDispatcher$$anonfun$1(JSExportsGen.scala:326)
[error] dotty.tools.backend.sjs.JSCodeGen.withNewLocalNameScope$$anonfun$1(JSCodeGen.scala:121)
[error] dotty.tools.backend.sjs.ScopedVar$.withScopedVars(ScopedVar.scala:33)
[error] dotty.tools.backend.sjs.JSCodeGen.withNewLocalNameScope(JSCodeGen.scala:122)
[error] dotty.tools.backend.sjs.JSExportsGen.genMemberExportOrDispatcher(JSExportsGen.scala:327)
[error] dotty.tools.backend.sjs.JSExportsGen.genJSClassDispatcher(JSExportsGen.scala:316)
[error] dotty.tools.backend.sjs.JSExportsGen.genJSClassDispatchers$$anonfun$1(JSExportsGen.scala:288)
[error] scala.collection.immutable.List.map(List.scala:246)
[error] dotty.tools.backend.sjs.JSExportsGen.genJSClassDispatchers(JSExportsGen.scala:288)
[error] dotty.tools.backend.sjs.JSCodeGen.genNonNativeJSClass(JSCodeGen.scala:593)
[error] dotty.tools.backend.sjs.JSCodeGen.genCompilationUnit$$anonfun$3$$anonfun$1(JSCodeGen.scala:239)
[error] dotty.tools.backend.sjs.ScopedVar$.withScopedVars(ScopedVar.scala:33)
[error] dotty.tools.backend.sjs.JSCodeGen.genCompilationUnit$$anonfun$3(JSCodeGen.scala:249)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.immutable.List.foreach(List.scala:333)
[error] dotty.tools.backend.sjs.JSCodeGen.genCompilationUnit(JSCodeGen.scala:251)
[error] dotty.tools.backend.sjs.JSCodeGen.run(JSCodeGen.scala:163)
[error] dotty.tools.backend.sjs.GenSJSIR.run(GenSJSIR.scala:18)
[error] dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:327)
[error] scala.collection.immutable.List.map(List.scala:250)
[error] dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:331)
[error] dotty.tools.dotc.Run.runPhases$1$$anonfun$1(Run.scala:246)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1321)
[error] dotty.tools.dotc.Run.runPhases$1(Run.scala:262)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:270)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$adapted$1(Run.scala:279)
[error] dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:279)
[error] dotty.tools.dotc.Run.compileSources(Run.scala:194)
[error] dotty.tools.dotc.Run.compile(Run.scala:179)
[error] dotty.tools.dotc.Driver.doCompile(Driver.scala:37)
[error] dotty.tools.xsbt.CompilerBridgeDriver.run(CompilerBridgeDriver.java:88)
[error] dotty.tools.xsbt.CompilerBridge.run(CompilerBridge.java:22)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:91)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$7(MixedAnalyzingCompiler.scala:193)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
[error] sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:248)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:183)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4$adapted(MixedAnalyzingCompiler.scala:163)
[error] sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:239)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:163)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:211)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5(Incremental.scala:180)
[error] sbt.internal.inc.Incremental$.$anonfun$apply$5$adapted(Incremental.scala:178)
[error] sbt.internal.inc.Incremental$$anon$2.run(Incremental.scala:464)
[error] sbt.internal.inc.IncrementalCommon$CycleState.next(IncrementalCommon.scala:116)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:56)
[error] sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:52)
[error] sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:263)
[error] sbt.internal.inc.Incremental$.$anonfun$incrementalCompile$8(Incremental.scala:419)
[error] sbt.internal.inc.Incremental$.withClassfileManager(Incremental.scala:506)
[error] sbt.internal.inc.Incremental$.incrementalCompile(Incremental.scala:406)
[error] sbt.internal.inc.Incremental$.apply(Incremental.scala:172)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:534)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:488)
[error] sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:425)
[error] sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
[error] sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:2371)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$2(Defaults.scala:2321)
[error] sbt.internal.server.BspCompileTask$.$anonfun$compute$1(BspCompileTask.scala:31)
[error] sbt.internal.io.Retry$.apply(Retry.scala:47)
[error] sbt.internal.io.Retry$.apply(Retry.scala:29)
[error] sbt.internal.io.Retry$.apply(Retry.scala:24)
[error] sbt.internal.server.BspCompileTask$.compute(BspCompileTask.scala:31)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:2319)
[error] scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:63)
[error] sbt.std.Transform$$anon$4.work(Transform.scala:69)
[error] sbt.Execute.$anonfun$submit$2(Execute.scala:283)
[error] sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:24)
[error] sbt.Execute.work(Execute.scala:292)
[error] sbt.Execute.$anonfun$submit$1(Execute.scala:283)
[error] sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:265)
[error] sbt.CompletionService$$anon$2.call(CompletionService.scala:65)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
[error] java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
[error] java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
[error] java.base/java.lang.Thread.run(Thread.java:833)
[error]
[error] stack trace is suppressed; run last frontend / Compile / compileIncremental for the full output
[error] (frontend / Compile / compileIncremental) scala.MatchError: AppliedType(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),object scala),class Tuple2),List(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),object scala),class Int), TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),object scala),class Int))) (of class dotty.tools.dotc.core.Types$CachedAppliedType)
[error] Total time: 2 s, completed Oct. 6, 2023, 12:16:44 a.m.

Expectation

The compiler shouldn't crash.

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