FatalError on PolyFunction in macro

[Adam-Vandervorst]

Compiler version

3.1.2-RC1-bin-20211222-c94b333-NIGHTLY

Minimized code

// poly_inline.scala
inline def foreach[T <: Tuple]
  (inline xs: T, inline f: [A] => (a: A) => Unit) = 
  ${ foreachImpl('{xs}, '{f}) }

@main def example =
  foreach(1 *: 2 *: EmptyTuple, [V] => (v: V) => println(v))

// macro_file.scala
import scala.quoted._

def foreachImpl[T <: Tuple : Type]
  (xs: Expr[T], f: Expr[[A] => A => Unit])
  (using Quotes): Expr[Unit] =
  xs match
    case '{ EmptyTuple } => '{ () }
    case '{ $t: Tuple1[t1] } => '{ $f($t._1) }
    case '{ $t: Tuple2[t1, t2] } => '{ $f($t._1); $f($t._2) }
    ...

Output

  foreach(1 *: 2 *: EmptyTuple, [V] => (v: V) => println(v))
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
undefined: {
  final class $anon() extends Object.<init>(), scala.this.PolyFunction {
    def apply[V >: scala.this.Nothing <: scala.this.Any](v: V): 
      scala.this.Unit(inf)
     = scala.this.Predef.println(v)
  }
  (new $anon.<init>():
    scala.this.PolyFunction{apply[V](v: V): scala.this.Unit}(inf)
  )
}.<none> # -1: TermRef(RefinedType(TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),trait PolyFunction),apply,PolyType(List(V), List(TypeBounds(TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),class Nothing),TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),class Any))), MethodType(List(v), List(TypeParamRef(V)), TypeRef(ThisType(TypeRef(NoPrefix,module class scala)),class Unit)))),<none>) at inlining
 This location contains code that was inlined from macro_file.scala:25
 This location contains code that was inlined from macro_file.scala:25
 one error found

Click the arrow to see the full stack trace.

dotty.tools.FatalError:
at dotty.tools.dotc.typer.TypeAssigner.assignType(TypeAssigner.scala:295)
at dotty.tools.dotc.typer.TypeAssigner.assignType$(TypeAssigner.scala:19)
at dotty.tools.dotc.typer.Typer.assignType(Typer.scala:119)
at dotty.tools.dotc.ast.tpd$TypedTreeCopier.Apply(tpd.scala:615)
at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1389)
at dotty.tools.dotc.quoted.PickledQuotes$$anon$1.transform(PickledQuotes.scala:106)
at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform$$anonfun$1(Trees.scala:1493)
at scala.collection.immutable.List.mapConserve(List.scala:472)
at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1493)
at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transformStats(Trees.scala:1491)
at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1403)
at dotty.tools.dotc.quoted.PickledQuotes$$anon$1.transform(PickledQuotes.scala:106)
at dotty.tools.dotc.quoted.PickledQuotes$.spliceTerms(PickledQuotes.scala:121)
at dotty.tools.dotc.quoted.PickledQuotes$.unpickleTerm(PickledQuotes.scala:60)
at scala.quoted.runtime.impl.QuotesImpl.unpickleExpr(QuotesImpl.scala:3002)
at poly_inline.macro_file$package$.foreachImpl(macro_file.scala:25)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at dotty.tools.dotc.transform.Splicer$Interpreter.interpretedStaticMethodCall$$anonfun$1$$anonfun$1(Splicer.scala:375)
at dotty.tools.dotc.transform.Splicer$Interpreter.stopIfRuntimeException(Splicer.scala:439)
at dotty.tools.dotc.transform.Splicer$Interpreter.interpretedStaticMethodCall$$anonfun$1(Splicer.scala:375)
at dotty.tools.dotc.transform.Splicer$Interpreter.interpretTree(Splicer.scala:268)
at dotty.tools.dotc.transform.Splicer$Interpreter.interpretTree$$anonfun$2(Splicer.scala:288)
at dotty.tools.dotc.transform.Splicer$.$anonfun$2(Splicer.scala:56)
at scala.Option.fold(Option.scala:263)
at dotty.tools.dotc.transform.Splicer$.splice(Splicer.scala:56)
at dotty.tools.dotc.typer.Inliner.dotty$tools$dotc$typer$Inliner$$expandMacro(Inliner.scala:1821)
at dotty.tools.dotc.typer.Inliner$InlineTyper.typedApply(Inliner.scala:1599)
at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2802)
at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2865)
at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:121)
at dotty.tools.dotc.typer.Inliner$InlineTyper.typedUnadapted(Inliner.scala:1682)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2930)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2934)
at dotty.tools.dotc.typer.ReTyper.typedTyped(ReTyper.scala:62)
at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2807)
at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2865)
at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:121)
at dotty.tools.dotc.typer.Inliner$InlineTyper.typedUnadapted(Inliner.scala:1682)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2930)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2934)
at dotty.tools.dotc.typer.Inliner.inlined(Inliner.scala:1052)
at dotty.tools.dotc.typer.Inliner$.inlineCall(Inliner.scala:160)
at dotty.tools.dotc.transform.Inlining$InliningTreeMap.transform(Inlining.scala:86)
at dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:103)
at dotty.tools.dotc.transform.Inlining$InliningTreeMap.transform(Inlining.scala:80)
at dotty.tools.dotc.ast.TreeMapWithImplicits.traverse$1(TreeMapWithImplicits.scala:53)
at dotty.tools.dotc.ast.TreeMapWithImplicits.transformStats(TreeMapWithImplicits.scala:60)
at dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:111)
at dotty.tools.dotc.transform.Inlining$InliningTreeMap.transform(Inlining.scala:80)
at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1466)
at dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:120)
at dotty.tools.dotc.transform.Inlining$InliningTreeMap.transform(Inlining.scala:80)
at dotty.tools.dotc.ast.TreeMapWithImplicits.traverse$1(TreeMapWithImplicits.scala:53)
at dotty.tools.dotc.ast.TreeMapWithImplicits.transformStats(TreeMapWithImplicits.scala:60)
at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1477)
at dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:120)
at dotty.tools.dotc.transform.Inlining$InliningTreeMap.transform(Inlining.scala:94)
at dotty.tools.dotc.transform.Inlining$$anon$2.transform(Inlining.scala:72)
at dotty.tools.dotc.transform.MacroTransform.run(MacroTransform.scala:21)
at dotty.tools.dotc.transform.Inlining.run(Inlining.scala:44)
at dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:308)
at scala.collection.immutable.List.map(List.scala:246)
at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:309)
at dotty.tools.dotc.transform.Inlining.runOn(Inlining.scala:48)
at dotty.tools.dotc.Run.runPhases$1$$anonfun$1(Run.scala:259)
at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
at dotty.tools.dotc.Run.runPhases$1(Run.scala:270)
at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:278)
at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:68)
at dotty.tools.dotc.Run.compileUnits(Run.scala:287)
at dotty.tools.dotc.Run.compileUnits(Run.scala:226)
at dotty.tools.dotc.Driver.finish(Driver.scala:60)
at dotty.tools.dotc.Driver.doCompile(Driver.scala:40)
at dotty.tools.xsbt.CompilerBridgeDriver.run(CompilerBridgeDriver.java:88)
at dotty.tools.xsbt.CompilerBridge.run(CompilerBridge.java:22)
at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:91)
at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$7(MixedAnalyzingCompiler.scala:192)
at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
at sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:247)
at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:182)
at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4$adapted(MixedAnalyzingCompiler.scala:163)
at sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:239)
at sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:163)
at sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:210)
at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:528)
at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:528)
at sbt.internal.inc.Incremental$.$anonfun$apply$5(Incremental.scala:175)
at sbt.internal.inc.Incremental$.$anonfun$apply$5$adapted(Incremental.scala:173)
at sbt.internal.inc.Incremental$$anon$2.run(Incremental.scala:459)
at sbt.internal.inc.IncrementalCommon$CycleState.next(IncrementalCommon.scala:116)
at sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:56)
at sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:52)
at sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:263)
at sbt.internal.inc.Incremental$.$anonfun$incrementalCompile$8(Incremental.scala:414)
at sbt.internal.inc.Incremental$.withClassfileManager(Incremental.scala:501)
at sbt.internal.inc.Incremental$.incrementalCompile(Incremental.scala:401)
at sbt.internal.inc.Incremental$.apply(Incremental.scala:167)
at sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:528)
at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:482)
at sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
at sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:420)
at sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
at sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:2357)
at sbt.Defaults$.$anonfun$compileIncrementalTask$2(Defaults.scala:2314)
at sbt.internal.io.Retry$.apply(Retry.scala:46)
at sbt.internal.io.Retry$.apply(Retry.scala:28)
at sbt.internal.io.Retry$.apply(Retry.scala:23)
at sbt.internal.server.BspCompileTask$.compute(BspCompileTask.scala:31)
at sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:2310)
at scala.Function1.$anonfun$compose$1(Function1.scala:49)
at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:62)
at sbt.std.Transform$$anon$4.work(Transform.scala:68)
at sbt.Execute.$anonfun$submit$2(Execute.scala:282)
at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:23)
at sbt.Execute.work(Execute.scala:291)
at sbt.Execute.$anonfun$submit$1(Execute.scala:282)
at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:265)
at sbt.CompletionService$$anon$2.call(CompletionService.scala:64)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
dotty.tools.FatalError:
at dotty.tools.dotc.typer.TypeAssigner.assignType(TypeAssigner.scala:295)
at dotty.tools.dotc.typer.TypeAssigner.assignType$(TypeAssigner.scala:19)
at dotty.tools.dotc.typer.Typer.assignType(Typer.scala:119)
at dotty.tools.dotc.ast.tpd$TypedTreeCopier.Apply(tpd.scala:615)
at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1389)
at dotty.tools.dotc.quoted.PickledQuotes$$anon$1.transform(PickledQuotes.scala:106)
at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1403)
at dotty.tools.dotc.quoted.PickledQuotes$$anon$1.transform(PickledQuotes.scala:106)
at dotty.tools.dotc.quoted.PickledQuotes$.spliceTerms(PickledQuotes.scala:121)
at dotty.tools.dotc.quoted.PickledQuotes$.unpickleTerm(PickledQuotes.scala:60)
at scala.quoted.runtime.impl.QuotesImpl.unpickleExpr(QuotesImpl.scala:3002)
at poly_inline.macro_file$package$.foreachImpl(macro_file.scala:25)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at dotty.tools.dotc.transform.Splicer$Interpreter.interpretedStaticMethodCall$$anonfun$1$$anonfun$1(Splicer.scala:375)
at dotty.tools.dotc.transform.Splicer$Interpreter.stopIfRuntimeException(Splicer.scala:439)
at dotty.tools.dotc.transform.Splicer$Interpreter.interpretedStaticMethodCall$$anonfun$1(Splicer.scala:375)
at dotty.tools.dotc.transform.Splicer$Interpreter.interpretTree(Splicer.scala:268)
at dotty.tools.dotc.transform.Splicer$Interpreter.interpretTree$$anonfun$2(Splicer.scala:288)
at dotty.tools.dotc.transform.Splicer$.$anonfun$2(Splicer.scala:56)
at scala.Option.fold(Option.scala:263)
at dotty.tools.dotc.transform.Splicer$.splice(Splicer.scala:56)
at dotty.tools.dotc.typer.Inliner.dotty$tools$dotc$typer$Inliner$$expandMacro(Inliner.scala:1821)
at dotty.tools.dotc.typer.Inliner$InlineTyper.typedApply(Inliner.scala:1599)
at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2802)
at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2865)
at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:121)
at dotty.tools.dotc.typer.Inliner$InlineTyper.typedUnadapted(Inliner.scala:1682)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2930)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2934)
at dotty.tools.dotc.typer.ReTyper.typedTyped(ReTyper.scala:62)
at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2807)
at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2865)
at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:121)
at dotty.tools.dotc.typer.Inliner$InlineTyper.typedUnadapted(Inliner.scala:1682)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2930)
at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2934)
at dotty.tools.dotc.typer.Inliner.inlined(Inliner.scala:1052)
at dotty.tools.dotc.typer.Inliner$.inlineCall(Inliner.scala:160)
at dotty.tools.dotc.transform.Inlining$InliningTreeMap.transform(Inlining.scala:86)
at dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:103)
at dotty.tools.dotc.transform.Inlining$InliningTreeMap.transform(Inlining.scala:80)
at dotty.tools.dotc.ast.TreeMapWithImplicits.traverse$1(TreeMapWithImplicits.scala:53)
at dotty.tools.dotc.ast.TreeMapWithImplicits.transformStats(TreeMapWithImplicits.scala:60)
at dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:111)
at dotty.tools.dotc.transform.Inlining$InliningTreeMap.transform(Inlining.scala:80)
at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1466)
at dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:120)
at dotty.tools.dotc.transform.Inlining$InliningTreeMap.transform(Inlining.scala:80)
at dotty.tools.dotc.ast.TreeMapWithImplicits.traverse$1(TreeMapWithImplicits.scala:53)
at dotty.tools.dotc.ast.TreeMapWithImplicits.transformStats(TreeMapWithImplicits.scala:60)
at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1477)
at dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:120)
at dotty.tools.dotc.transform.Inlining$InliningTreeMap.transform(Inlining.scala:94)
at dotty.tools.dotc.transform.Inlining$$anon$2.transform(Inlining.scala:72)
at dotty.tools.dotc.transform.MacroTransform.run(MacroTransform.scala:21)
at dotty.tools.dotc.transform.Inlining.run(Inlining.scala:44)
at dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:308)
at scala.collection.immutable.List.map(List.scala:246)
at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:309)
at dotty.tools.dotc.transform.Inlining.runOn(Inlining.scala:48)
at dotty.tools.dotc.Run.runPhases$1$$anonfun$1(Run.scala:259)
at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
at dotty.tools.dotc.Run.runPhases$1(Run.scala:270)
at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:278)
at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:68)
at dotty.tools.dotc.Run.compileUnits(Run.scala:287)
at dotty.tools.dotc.Run.compileUnits(Run.scala:226)
at dotty.tools.dotc.Driver.finish(Driver.scala:60)
at dotty.tools.dotc.Driver.doCompile(Driver.scala:40)
at dotty.tools.xsbt.CompilerBridgeDriver.run(CompilerBridgeDriver.java:88)
at dotty.tools.xsbt.CompilerBridge.run(CompilerBridge.java:22)
at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:91)
at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$7(MixedAnalyzingCompiler.scala:192)
at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
at sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:247)
at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:182)
at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4$adapted(MixedAnalyzingCompiler.scala:163)
at sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:239)
at sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:163)
at sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:210)
at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:528)
at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:528)
at sbt.internal.inc.Incremental$.$anonfun$apply$5(Incremental.scala:175)
at sbt.internal.inc.Incremental$.$anonfun$apply$5$adapted(Incremental.scala:173)
at sbt.internal.inc.Incremental$$anon$2.run(Incremental.scala:459)
at sbt.internal.inc.IncrementalCommon$CycleState.next(IncrementalCommon.scala:116)
at sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:56)
at sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:52)
at sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:263)
at sbt.internal.inc.Incremental$.$anonfun$incrementalCompile$8(Incremental.scala:414)
at sbt.internal.inc.Incremental$.withClassfileManager(Incremental.scala:501)
at sbt.internal.inc.Incremental$.incrementalCompile(Incremental.scala:401)
at sbt.internal.inc.Incremental$.apply(Incremental.scala:167)
at sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:528)
at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:482)
at sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
at sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:420)
at sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
at sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:2357)
at sbt.Defaults$.$anonfun$compileIncrementalTask$2(Defaults.scala:2314)
at sbt.internal.io.Retry$.apply(Retry.scala:46)
at sbt.internal.io.Retry$.apply(Retry.scala:28)
at sbt.internal.io.Retry$.apply(Retry.scala:23)
at sbt.internal.server.BspCompileTask$.compute(BspCompileTask.scala:31)
at sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:2310)
at scala.Function1.$anonfun$compose$1(Function1.scala:49)
at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:62)
at sbt.std.Transform$$anon$4.work(Transform.scala:68)
at sbt.Execute.$anonfun$submit$2(Execute.scala:282)
at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:23)
at sbt.Execute.work(Execute.scala:291)
at sbt.Execute.$anonfun$submit$1(Execute.scala:282)
at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:265)
at sbt.CompletionService$$anon$2.call(CompletionService.scala:64)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)

Expectation

Still on the quest to unroll a for-loop, trying to implement #13958 (reply in thread).

[nicolasstucki]

Minimized

import scala.quoted._
def impl(using Quotes): Expr[Unit] =
  '{ ([V] => (v: V) => println(v)).apply[Int](2) }

inline def foo = ${ impl }
def example = foo

2 |def example = foo
  |              ^^^
  |undefined: {
  |  final class $anon() extends Object(), PolyFunction {
  |    def apply[V >: Nothing <: Any](v: V): Unit = println(v)
  |  }
  |  (new $anon():([V] => (V) => Unit))
  |}.<none> # -1: TermRef(RefinedType(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),object scala),PolyFunction),apply,PolyType(List(V), List(TypeBounds(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),object scala),Nothing),TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),object scala),Any))), MethodType(List(v), List(TypeParamRef(V)), TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),object scala),Unit)))),<none>) at inlining
  | This location contains code that was inlined from Bar.scala:3
  | This location contains code that was inlined from Bar.scala:3

[nicolasstucki]

@smarter are there going to be more changes in the encoding of PolyFunction?

[smarter]

We might introduce a way to represent polymorphic by-names, but it's unlikely we'll change the current encoding given the backwards compatibility headaches that would create.