Crash in macros during separate compilation

[anatoliykmetyuk]

Macros1.scala:

import scala.quoted.{ QuoteContext, Expr, Type }

trait M[T] {
  def f: Any
}

inline def g[T: Type](em: Expr[M[T]])(given QuoteContext) = '{$em.f}

Macros2.scala:

import scala.quoted.{ QuoteContext, Expr }

def h(m: Expr[M[String]])(given QuoteContext): Expr[Any] = g(m)

Compile them separately, e.g.:

sbt:dotty> ;dotty-bootstrapped/dotc ../pg/i6/Macros1.scala ;dotty-bootstrapped/dotc -classpath . ../pg/i6/Macros2.scala

You will get:

Crash

[warn] Multiple main classes detected.  Run 'show discoveredMainClasses' to see the list
[warn] Multiple main classes detected.  Run 'show discoveredMainClasses' to see the list
[info] Running (fork) dotty.tools.dotc.Main -classpath /Users/anatolii/.ivy2/cache/org.scala-lang/scala-library/jars/scala-library-2.13.1.jar:/Users/anatolii/Projects/dotty/dotty/library/../out/bootstrap/dotty-library-bootstrapped/scala-0.20/dotty-library_0.20-0.20.0-bin-SNAPSHOT.jar ../pg/i7322/Macros_1.scala
[success] Total time: 9 s, completed Sep 27, 2019 3:01:59 PM
[warn] Multiple main classes detected.  Run 'show discoveredMainClasses' to see the list
[warn] Multiple main classes detected.  Run 'show discoveredMainClasses' to see the list
[info] Running (fork) dotty.tools.dotc.Main -classpath .:/Users/anatolii/.ivy2/cache/org.scala-lang/scala-library/jars/scala-library-2.13.1.jar:/Users/anatolii/Projects/dotty/dotty/library/../out/bootstrap/dotty-library-bootstrapped/scala-0.20/dotty-library_0.20-0.20.0-bin-SNAPSHOT.jar ../pg/i7322/Macros_2.scala
exception while typing {
  {
    def $anonfun$2(x$0: scala.collection.immutable.Seq[Any]):
      quoted.Type[String]
     = evidence$1
    closure($anonfun$2)
  }
} of class class dotty.tools.dotc.ast.Trees$Inlined # 1486
exception while typing scala.collection.immutable.Nil.::[
  scala.collection.immutable.Seq[Any] => ((given scala.quoted.QuoteContext) =>
    scala.quoted.Expr[Any]
  ) | scala.quoted.Type[?]
](
  {
    {
      def $anonfun$2(x$0: scala.collection.immutable.Seq[Any]):
        quoted.Type[String]
       = evidence$1
      closure($anonfun$2)
    }
  }
) of class class dotty.tools.dotc.ast.Trees$Apply # 3244
exception while typing scala.collection.immutable.Nil.::[
  scala.collection.immutable.Seq[Any] => ((given scala.quoted.QuoteContext) =>
    scala.quoted.Expr[Any]
  ) | scala.quoted.Type[?]
](
  {
    {
      def $anonfun$2(x$0: scala.collection.immutable.Seq[Any]):
        quoted.Type[String]
       = evidence$1
      closure($anonfun$2)
    }
  }
).:: of class class dotty.tools.dotc.ast.Trees$Select # 3245
exception while typing scala.collection.immutable.Nil.::[
  scala.collection.immutable.Seq[Any] => ((given scala.quoted.QuoteContext) =>
    scala.quoted.Expr[Any]
  ) | scala.quoted.Type[?]
](
  {
    {
      def $anonfun$2(x$0: scala.collection.immutable.Seq[Any]):
        quoted.Type[String]
       = evidence$1
      closure($anonfun$2)
    }
  }
).::[
  scala.collection.immutable.Seq[Any] => ((given scala.quoted.QuoteContext) =>
    scala.quoted.Expr[Any]
  ) | scala.quoted.Type[?]
] of class class dotty.tools.dotc.ast.Trees$TypeApply # 3246
exception while typing scala.collection.immutable.Nil.::[
  scala.collection.immutable.Seq[Any] => ((given scala.quoted.QuoteContext) =>
    scala.quoted.Expr[Any]
  ) | scala.quoted.Type[?]
](
  {
    {
      def $anonfun$2(x$0: scala.collection.immutable.Seq[Any]):
        quoted.Type[String]
       = evidence$1
      closure($anonfun$2)
    }
  }
).::[
  scala.collection.immutable.Seq[Any] => ((given scala.quoted.QuoteContext) =>
    scala.quoted.Expr[Any]
  ) | scala.quoted.Type[?]
](
  {
    {
      def $anonfun$1(x$0: scala.collection.immutable.Seq[Any]):
        (given quoted.QuoteContext) => quoted.Expr[M[String]]
       =
        {
          def $anonfun(given evidence$2: quoted.QuoteContext):
            quoted.Expr[M[String]]
           =
            {
              m
            }
          closure($anonfun)
        }
      closure($anonfun$1)
    }
  }
) of class class dotty.tools.dotc.ast.Trees$Apply # 3247
exception while typing scala.runtime.quoted.Unpickler.unpickleExpr$direct[Any](
  scala.collection.immutable.Nil.::[String](

      "XKGrH5GAAHmgaRPcQgAAneD27My4AAHuAYRBU1RzAYFmAYRqYXZhAYRsYW5nAoKCgwGGT2JqZWN0AoKEhT+CgYYBgSQBjGV2aWRlbmNlJDEkXwqDiIGJAYxxdW90ZVR5cGVUYWcBhlF1b3RlZBeBjAGFc2NhbGEBiGludGVybmFsAoKOjwGGPGluaXQ+AoKQjBeBkgKCk4s/gpGUAZBNYWNyb3NfMiRwYWNrYWdlF4GWAYc8ZW1wdHk+AYlQb3NpdGlvbnMBvy9Vc2Vycy9hbmF0b2xpaS9Qcm9qZWN0cy9kb3R0eS9kb3R0eS8uLi9wZy9pNzMyMi9NYWNyb3NfMS5zY2FsYYCrk6mMoHCHk4P/gYCDl4qkg/+BgRetjnWLUHWNNpCIhXCVVjOWb5d1l1A3mJmZhwGLAZOAhJoCoYB+voL6qH+jhYST/oCRgA=="

  )
,
  scala.collection.immutable.Nil.::[
    scala.collection.immutable.Seq[Any] => ((given scala.quoted.QuoteContext)
       =>
    scala.quoted.Expr[Any]) | scala.quoted.Type[?]
  ](
    {
      {
        def $anonfun$2(x$0: scala.collection.immutable.Seq[Any]):
          quoted.Type[String]
         = evidence$1
        closure($anonfun$2)
      }
    }
  ).::[
    scala.collection.immutable.Seq[Any] => ((given scala.quoted.QuoteContext)
       =>
    scala.quoted.Expr[Any]) | scala.quoted.Type[?]
  ](
    {
      {
        def $anonfun$1(x$0: scala.collection.immutable.Seq[Any]):
          (given quoted.QuoteContext) => quoted.Expr[M[String]]
         =
          {
            def $anonfun(given evidence$2: quoted.QuoteContext):
              quoted.Expr[M[String]]
             =
              {
                m
              }
            closure($anonfun)
          }
        closure($anonfun$1)
      }
    }
  )
) of class class dotty.tools.dotc.ast.Trees$Apply # 3248
exception while typing scala.runtime.quoted.Unpickler.unpickleExpr$direct[Any](
  scala.collection.immutable.Nil.::[String](

      "XKGrH5GAAHmgaRPcQgAAneD27My4AAHuAYRBU1RzAYFmAYRqYXZhAYRsYW5nAoKCgwGGT2JqZWN0AoKEhT+CgYYBgSQBjGV2aWRlbmNlJDEkXwqDiIGJAYxxdW90ZVR5cGVUYWcBhlF1b3RlZBeBjAGFc2NhbGEBiGludGVybmFsAoKOjwGGPGluaXQ+AoKQjBeBkgKCk4s/gpGUAZBNYWNyb3NfMiRwYWNrYWdlF4GWAYc8ZW1wdHk+AYlQb3NpdGlvbnMBvy9Vc2Vycy9hbmF0b2xpaS9Qcm9qZWN0cy9kb3R0eS9kb3R0eS8uLi9wZy9pNzMyMi9NYWNyb3NfMS5zY2FsYYCrk6mMoHCHk4P/gYCDl4qkg/+BgRetjnWLUHWNNpCIhXCVVjOWb5d1l1A3mJmZhwGLAZOAhJoCoYB+voL6qH+jhYST/oCRgA=="

  )
,
  scala.collection.immutable.Nil.::[
    scala.collection.immutable.Seq[Any] => ((given scala.quoted.QuoteContext)
       =>
    scala.quoted.Expr[Any]) | scala.quoted.Type[?]
  ](
    {
      {
        def $anonfun$2(x$0: scala.collection.immutable.Seq[Any]):
          quoted.Type[String]
         = evidence$1
        closure($anonfun$2)
      }
    }
  ).::[
    scala.collection.immutable.Seq[Any] => ((given scala.quoted.QuoteContext)
       =>
    scala.quoted.Expr[Any]) | scala.quoted.Type[?]
  ](
    {
      {
        def $anonfun$1(x$0: scala.collection.immutable.Seq[Any]):
          (given quoted.QuoteContext) => quoted.Expr[M[String]]
         =
          {
            def $anonfun(given evidence$2: quoted.QuoteContext):
              quoted.Expr[M[String]]
             =
              {
                m
              }
            closure($anonfun)
          }
        closure($anonfun$1)
      }
    }
  )
)(
  {
    x$2
  }
) of class class dotty.tools.dotc.ast.Trees$Apply # 3249
exception while typing {
  val evidence$1: quoted.Type[String] =
    scala.runtime.quoted.Unpickler.unpickleType$direct[String](
      scala.collection.immutable.Nil.::[String](

          "XKGrH5GAAB+NFPi9VAAAAOsA64QAAOoBhEFTVHMBhlN0cmluZwGEamF2YQGEbGFuZwKCgoMBiVBvc2l0aW9ucwG/L1VzZXJzL2FuYXRvbGlpL1Byb2plY3RzL2RvdHR5L2RvdHR5Ly4uL3BnL2k3MzIyL01hY3Jvc18yLnNjYWxhgIR1gTaEhYeGAOsA64SG"

      )
    , scala.collection.immutable.Nil)(x$2)
  scala.runtime.quoted.Unpickler.unpickleExpr$direct[Any](
    scala.collection.immutable.Nil.::[String](

        "XKGrH5GAAHmgaRPcQgAAneD27My4AAHuAYRBU1RzAYFmAYRqYXZhAYRsYW5nAoKCgwGGT2JqZWN0AoKEhT+CgYYBgSQBjGV2aWRlbmNlJDEkXwqDiIGJAYxxdW90ZVR5cGVUYWcBhlF1b3RlZBeBjAGFc2NhbGEBiGludGVybmFsAoKOjwGGPGluaXQ+AoKQjBeBkgKCk4s/gpGUAZBNYWNyb3NfMiRwYWNrYWdlF4GWAYc8ZW1wdHk+AYlQb3NpdGlvbnMBvy9Vc2Vycy9hbmF0b2xpaS9Qcm9qZWN0cy9kb3R0eS9kb3R0eS8uLi9wZy9pNzMyMi9NYWNyb3NfMS5zY2FsYYCrk6mMoHCHk4P/gYCDl4qkg/+BgRetjnWLUHWNNpCIhXCVVjOWb5d1l1A3mJmZhwGLAZOAhJoCoYB+voL6qH+jhYST/oCRgA=="

    )
  ,
    scala.collection.immutable.Nil.::[
      scala.collection.immutable.Seq[Any] => ((given scala.quoted.QuoteContext)
         =>
      scala.quoted.Expr[Any]) | scala.quoted.Type[?]
    ](
      {
        {
          def $anonfun$2(x$0: scala.collection.immutable.Seq[Any]):
            quoted.Type[String]
           = evidence$1
          closure($anonfun$2)
        }
      }
    ).::[
      scala.collection.immutable.Seq[Any] => ((given scala.quoted.QuoteContext)
         =>
      scala.quoted.Expr[Any]) | scala.quoted.Type[?]
    ](
      {
        {
          def $anonfun$1(x$0: scala.collection.immutable.Seq[Any]):
            (given quoted.QuoteContext) => quoted.Expr[M[String]]
           =
            {
              def $anonfun(given evidence$2: quoted.QuoteContext):
                quoted.Expr[M[String]]
               =
                {
                  m
                }
              closure($anonfun)
            }
          closure($anonfun$1)
        }
      }
    )
  )(
    {
      x$2
    }
  )
} of class class dotty.tools.dotc.ast.Trees$Inlined # 1527
exception while typing def h(m: quoted.Expr[M[String]])(given x$2: quoted.QuoteContext):
  quoted.Expr[Any]
 =
  {
    val evidence$1: quoted.Type[String] =
      scala.runtime.quoted.Unpickler.unpickleType$direct[String](
        scala.collection.immutable.Nil.::[String](

            "XKGrH5GAAB+NFPi9VAAAAOsA64QAAOoBhEFTVHMBhlN0cmluZwGEamF2YQGEbGFuZwKCgoMBiVBvc2l0aW9ucwG/L1VzZXJzL2FuYXRvbGlpL1Byb2plY3RzL2RvdHR5L2RvdHR5Ly4uL3BnL2k3MzIyL01hY3Jvc18yLnNjYWxhgIR1gTaEhYeGAOsA64SG"

        )
      , scala.collection.immutable.Nil)(x$2)
    scala.runtime.quoted.Unpickler.unpickleExpr$direct[Any](
      scala.collection.immutable.Nil.::[String](

          "XKGrH5GAAHmgaRPcQgAAneD27My4AAHuAYRBU1RzAYFmAYRqYXZhAYRsYW5nAoKCgwGGT2JqZWN0AoKEhT+CgYYBgSQBjGV2aWRlbmNlJDEkXwqDiIGJAYxxdW90ZVR5cGVUYWcBhlF1b3RlZBeBjAGFc2NhbGEBiGludGVybmFsAoKOjwGGPGluaXQ+AoKQjBeBkgKCk4s/gpGUAZBNYWNyb3NfMiRwYWNrYWdlF4GWAYc8ZW1wdHk+AYlQb3NpdGlvbnMBvy9Vc2Vycy9hbmF0b2xpaS9Qcm9qZWN0cy9kb3R0eS9kb3R0eS8uLi9wZy9pNzMyMi9NYWNyb3NfMS5zY2FsYYCrk6mMoHCHk4P/gYCDl4qkg/+BgRetjnWLUHWNNpCIhXCVVjOWb5d1l1A3mJmZhwGLAZOAhJoCoYB+voL6qH+jhYST/oCRgA=="

      )
    ,
      scala.collection.immutable.Nil.::[
        scala.collection.immutable.Seq[Any] => ((given scala.quoted.QuoteContext
          )
         => scala.quoted.Expr[Any]) | scala.quoted.Type[?]
      ](
        {
          {
            def $anonfun$2(x$0: scala.collection.immutable.Seq[Any]):
              quoted.Type[String]
             = evidence$1
            closure($anonfun$2)
          }
        }
      ).::[
        scala.collection.immutable.Seq[Any] => ((given scala.quoted.QuoteContext
          )
         => scala.quoted.Expr[Any]) | scala.quoted.Type[?]
      ](
        {
          {
            def $anonfun$1(x$0: scala.collection.immutable.Seq[Any]):
              (given quoted.QuoteContext) => quoted.Expr[M[String]]
             =
              {
                def $anonfun(given evidence$2: quoted.QuoteContext):
                  quoted.Expr[M[String]]
                 =
                  {
                    m
                  }
                closure($anonfun)
              }
            closure($anonfun$1)
          }
        }
      )
    )(
      {
        x$2
      }
    )
  } of class class dotty.tools.dotc.ast.Trees$DefDef # 1528
exception while typing @scala.annotation.internal.SourceFile("../pg/i7322/Macros_2.scala") final module

class Macros_2$package$() extends Object(), Serializable {
  private def writeReplace(): AnyRef =
    new scala.runtime.ModuleSerializationProxy(classOf[Macros_2$package.type])
  def h(m: quoted.Expr[M[String]])(given x$2: quoted.QuoteContext):
    quoted.Expr[Any]
   =
    {
      val evidence$1: quoted.Type[String] =
        scala.runtime.quoted.Unpickler.unpickleType$direct[String](
          scala.collection.immutable.Nil.::[String](

              "XKGrH5GAAB+NFPi9VAAAAOsA64QAAOoBhEFTVHMBhlN0cmluZwGEamF2YQGEbGFuZwKCgoMBiVBvc2l0aW9ucwG/L1VzZXJzL2FuYXRvbGlpL1Byb2plY3RzL2RvdHR5L2RvdHR5Ly4uL3BnL2k3MzIyL01hY3Jvc18yLnNjYWxhgIR1gTaEhYeGAOsA64SG"

          )
        , scala.collection.immutable.Nil)(x$2)
      scala.runtime.quoted.Unpickler.unpickleExpr$direct[Any](
        scala.collection.immutable.Nil.::[String](

            "XKGrH5GAAHmgaRPcQgAAneD27My4AAHuAYRBU1RzAYFmAYRqYXZhAYRsYW5nAoKCgwGGT2JqZWN0AoKEhT+CgYYBgSQBjGV2aWRlbmNlJDEkXwqDiIGJAYxxdW90ZVR5cGVUYWcBhlF1b3RlZBeBjAGFc2NhbGEBiGludGVybmFsAoKOjwGGPGluaXQ+AoKQjBeBkgKCk4s/gpGUAZBNYWNyb3NfMiRwYWNrYWdlF4GWAYc8ZW1wdHk+AYlQb3NpdGlvbnMBvy9Vc2Vycy9hbmF0b2xpaS9Qcm9qZWN0cy9kb3R0eS9kb3R0eS8uLi9wZy9pNzMyMi9NYWNyb3NfMS5zY2FsYYCrk6mMoHCHk4P/gYCDl4qkg/+BgRetjnWLUHWNNpCIhXCVVjOWb5d1l1A3mJmZhwGLAZOAhJoCoYB+voL6qH+jhYST/oCRgA=="

        )
      ,
        scala.collection.immutable.Nil.::[
          scala.collection.immutable.Seq[Any] => ((given
            scala.quoted.QuoteContext
          ) => scala.quoted.Expr[Any]) | scala.quoted.Type[?]
        ](
          {
            {
              def $anonfun$2(x$0: scala.collection.immutable.Seq[Any]):
                quoted.Type[String]
               = evidence$1
              closure($anonfun$2)
            }
          }
        ).::[
          scala.collection.immutable.Seq[Any] => ((given
            scala.quoted.QuoteContext
          ) => scala.quoted.Expr[Any]) | scala.quoted.Type[?]
        ](
          {
            {
              def $anonfun$1(x$0: scala.collection.immutable.Seq[Any]):
                (given quoted.QuoteContext) => quoted.Expr[M[String]]
               =
                {
                  def $anonfun(given evidence$2: quoted.QuoteContext):
                    quoted.Expr[M[String]]
                   =
                    {
                      m
                    }
                  closure($anonfun)
                }
              closure($anonfun$1)
            }
          }
        )
      )(
        {
          x$2
        }
      )
    }
} of class class dotty.tools.dotc.ast.Trees$TypeDef # 1530
exception while typing package <empty> {
  final lazy module val Macros_2$package: Macros_2$package$ =
    new Macros_2$package$()
  @scala.annotation.internal.SourceFile("../pg/i7322/Macros_2.scala") final
    module
   class Macros_2$package$() extends Object(), Serializable {
    private def writeReplace(): AnyRef =
      new scala.runtime.ModuleSerializationProxy(classOf[Macros_2$package.type])
    def h(m: quoted.Expr[M[String]])(given x$2: quoted.QuoteContext):
      quoted.Expr[Any]
     =
      {
        val evidence$1: quoted.Type[String] =
          scala.runtime.quoted.Unpickler.unpickleType$direct[String](
            scala.collection.immutable.Nil.::[String](

                "XKGrH5GAAB+NFPi9VAAAAOsA64QAAOoBhEFTVHMBhlN0cmluZwGEamF2YQGEbGFuZwKCgoMBiVBvc2l0aW9ucwG/L1VzZXJzL2FuYXRvbGlpL1Byb2plY3RzL2RvdHR5L2RvdHR5Ly4uL3BnL2k3MzIyL01hY3Jvc18yLnNjYWxhgIR1gTaEhYeGAOsA64SG"

            )
          , scala.collection.immutable.Nil)(x$2)
        scala.runtime.quoted.Unpickler.unpickleExpr$direct[Any](
          scala.collection.immutable.Nil.::[String](

              "XKGrH5GAAHmgaRPcQgAAneD27My4AAHuAYRBU1RzAYFmAYRqYXZhAYRsYW5nAoKCgwGGT2JqZWN0AoKEhT+CgYYBgSQBjGV2aWRlbmNlJDEkXwqDiIGJAYxxdW90ZVR5cGVUYWcBhlF1b3RlZBeBjAGFc2NhbGEBiGludGVybmFsAoKOjwGGPGluaXQ+AoKQjBeBkgKCk4s/gpGUAZBNYWNyb3NfMiRwYWNrYWdlF4GWAYc8ZW1wdHk+AYlQb3NpdGlvbnMBvy9Vc2Vycy9hbmF0b2xpaS9Qcm9qZWN0cy9kb3R0eS9kb3R0eS8uLi9wZy9pNzMyMi9NYWNyb3NfMS5zY2FsYYCrk6mMoHCHk4P/gYCDl4qkg/+BgRetjnWLUHWNNpCIhXCVVjOWb5d1l1A3mJmZhwGLAZOAhJoCoYB+voL6qH+jhYST/oCRgA=="

          )
        ,
          scala.collection.immutable.Nil.::[
            scala.collection.immutable.Seq[Any] => ((given
              scala.quoted.QuoteContext
            ) => scala.quoted.Expr[Any]) | scala.quoted.Type[?]
          ](
            {
              {
                def $anonfun$2(x$0: scala.collection.immutable.Seq[Any]):
                  quoted.Type[String]
                 = evidence$1
                closure($anonfun$2)
              }
            }
          ).::[
            scala.collection.immutable.Seq[Any] => ((given
              scala.quoted.QuoteContext
            ) => scala.quoted.Expr[Any]) | scala.quoted.Type[?]
          ](
            {
              {
                def $anonfun$1(x$0: scala.collection.immutable.Seq[Any]):
                  (given quoted.QuoteContext) => quoted.Expr[M[String]]
                 =
                  {
                    def $anonfun(given evidence$2: quoted.QuoteContext):
                      quoted.Expr[M[String]]
                     =
                      {
                        m
                      }
                    closure($anonfun)
                  }
                closure($anonfun$1)
              }
            }
          )
        )(
          {
            x$2
          }
        )
      }
  }
} of class class dotty.tools.dotc.ast.Trees$PackageDef # 1531
exception occurred while compiling ../pg/i7322/Macros_2.scala
java.lang.AssertionError: assertion failed: position not set for {
  def $anonfun$2(x$0: scala.collection.immutable.Seq[Any]): quoted.Type[String]
     =
  evidence$1
  closure($anonfun$2)
} # 3204 of class dotty.tools.dotc.ast.Trees$Block in ../pg/i7322/Macros_1.scala while compiling ../pg/i7322/Macros_2.scala
Exception in thread "main" java.lang.AssertionError: assertion failed: position not set for {
  def $anonfun$2(x$0: scala.collection.immutable.Seq[Any]): quoted.Type[String]
     =
  evidence$1
  closure($anonfun$2)
} # 3204 of class dotty.tools.dotc.ast.Trees$Block in ../pg/i7322/Macros_1.scala
  at dotty.DottyPredef$.assertFail(DottyPredef.scala:17)
  at dotty.tools.dotc.typer.Typer$.assertPositioned(Typer.scala:58)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2149)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2165)
  at dotty.tools.dotc.typer.Typer.typedInlined(Typer.scala:1291)
  at dotty.tools.dotc.transform.Erasure$Typer.typedInlined(Erasure.scala:595)
  at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2082)
  at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2117)
  at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:123)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2153)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2151)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2165)
  at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2241)
  at dotty.tools.dotc.transform.Erasure$Typer.$anonfun$5(Erasure.scala:564)
  at dotty.tools.dotc.core.Decorators$ListDecorator$.zipWithConserve$extension(Decorators.scala:110)
  at dotty.tools.dotc.transform.Erasure$Typer.typedApply(Erasure.scala:564)
  at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2061)
  at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2117)
  at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:123)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2153)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2165)
  at dotty.tools.dotc.transform.Erasure$Typer.typedSelect(Erasure.scala:429)
  at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2041)
  at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2116)
  at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:123)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2153)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2165)
  at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2241)
  at dotty.tools.dotc.transform.Erasure$Typer.typedTypeApply(Erasure.scala:530)
  at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2079)
  at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2117)
  at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:123)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2153)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2165)
  at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2241)
  at dotty.tools.dotc.transform.Erasure$Typer.typedApply(Erasure.scala:548)
  at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2061)
  at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2117)
  at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:123)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2153)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2165)
  at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2241)
  at dotty.tools.dotc.transform.Erasure$Typer.$anonfun$5(Erasure.scala:564)
  at dotty.tools.dotc.core.Decorators$ListDecorator$.zipWithConserve$extension(Decorators.scala:110)
  at dotty.tools.dotc.core.Decorators$ListDecorator$.zipWithConserve$extension(Decorators.scala:111)
  at dotty.tools.dotc.transform.Erasure$Typer.typedApply(Erasure.scala:564)
  at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2061)
  at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2117)
  at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:123)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2153)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2165)
  at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2241)
  at dotty.tools.dotc.transform.Erasure$Typer.typedApply(Erasure.scala:548)
  at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2061)
  at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2117)
  at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:123)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2153)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2151)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2165)
  at dotty.tools.dotc.typer.Typer.typedInlined(Typer.scala:1291)
  at dotty.tools.dotc.transform.Erasure$Typer.typedInlined(Erasure.scala:595)
  at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2082)
  at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2117)
  at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:123)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2153)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2165)
  at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2241)
  at dotty.tools.dotc.typer.Typer.typedDefDef(Typer.scala:1600)
  at dotty.tools.dotc.transform.Erasure$Typer.typedDefDef(Erasure.scala:635)
  at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2048)
  at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2116)
  at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:123)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2153)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2165)
  at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2184)
  at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2228)
  at dotty.tools.dotc.transform.Erasure$Typer.typedStats(Erasure.scala:747)
  at dotty.tools.dotc.typer.Typer.typedClassDef(Typer.scala:1727)
  at dotty.tools.dotc.typer.Typer.typedNamed$1(Typer.scala:2051)
  at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2116)
  at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:123)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2153)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2165)
  at dotty.tools.dotc.typer.Typer.traverse$1(Typer.scala:2184)
  at dotty.tools.dotc.typer.Typer.typedStats(Typer.scala:2228)
  at dotty.tools.dotc.transform.Erasure$Typer.typedStats(Erasure.scala:747)
  at dotty.tools.dotc.typer.Typer.typedPackageDef(Typer.scala:1852)
  at dotty.tools.dotc.typer.Typer.typedUnnamed$1(Typer.scala:2092)
  at dotty.tools.dotc.typer.Typer.typedUnadapted(Typer.scala:2117)
  at dotty.tools.dotc.typer.ReTyper.typedUnadapted(ReTyper.scala:123)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2153)
  at dotty.tools.dotc.typer.Typer.typed(Typer.scala:2165)
  at dotty.tools.dotc.typer.Typer.typedExpr(Typer.scala:2241)
  at dotty.tools.dotc.transform.Erasure.run(Erasure.scala:100)
  at dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:315)
  at scala.collection.immutable.List.map(List.scala:219)
  at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:316)
  at dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:159)
  at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
  at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
  at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
  at dotty.tools.dotc.Run.runPhases$5(Run.scala:169)
  at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:177)
  at dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
  at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
  at dotty.tools.dotc.Run.compileUnits(Run.scala:184)
  at dotty.tools.dotc.Run.compileSources(Run.scala:121)
  at dotty.tools.dotc.Run.compile(Run.scala:104)
  at dotty.tools.dotc.Driver.doCompile(Driver.scala:35)
  at dotty.tools.dotc.Driver.process(Driver.scala:178)
  at dotty.tools.dotc.Driver.process(Driver.scala:147)
  at dotty.tools.dotc.Driver.process(Driver.scala:159)
  at dotty.tools.dotc.Driver.main(Driver.scala:186)
  at dotty.tools.dotc.Main.main(Main.scala)
[error] Nonzero exit code returned from runner: 1
[error] (dotty-compiler-bootstrapped / Compile / runMain) Nonzero exit code returned from runner: 1
[error] Total time: 9 s, completed Sep 27, 2019 3:02:08 PM
sbt:dotty>

If you put the contents of Macros1.scala in Macros2.scala and compile only the latter, it will compile.

[milessabin]

I'll bet you can reproduce that with a handwritten Mirror instance.

[anatoliykmetyuk]

Could be, so far I haven't had any luck with it.

[anatoliykmetyuk]

My reasoning behind blaming mirrors is that the error message says "assertion failed: position not set" and the knowledge that fromProduct is magic. But I haven't had a more detailed look yet.

[anatoliykmetyuk]

You were right @milessabin, nothing to do with the mirrors. I've updated the initial post with a better-minimized example.

[anatoliykmetyuk]

Doesn't reproduce anymore. We should add a regression test when #7342 is fixed.