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No synthetics for method PimpedFoo: synthetics contains #5877

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scabug opened this issue Jun 3, 2012 · 6 comments
Closed

No synthetics for method PimpedFoo: synthetics contains #5877

scabug opened this issue Jun 3, 2012 · 6 comments

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@scabug
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@scabug scabug commented Jun 3, 2012

package foo {
  class Foo
}

package object foo {
  implicit class PimpedFoo(foo: Foo) {
    def bar = ???
  }
}
error: No synthetics for method PimpedFoo: synthetics contains 
error: 
     while compiling: Test.scala
        during phase: typer
     library version: version 2.10.0-20120603-142856-83434f60c4
    compiler version: version 2.10.0-20120603-142856-83434f60c4
  reconstructed args: -language:experimental.macros

  last tree to typer: Literal(Constant(()))
              symbol: null
   symbol definition: null
                 tpe: Unit
       symbol owners: 
      context owners: package package -> package foo

== Enclosing template or block ==

Template( // val <local package>: <notype> in package foo
  "java.lang.Object" // parents
  ValDef(
    private
    "_"
    <tpt>
    <empty>
  )
  // 2 statements
  DefDef( // def <init>: <?> in package foo
    <method>
    "<init>"
    []
    List(Nil)
    <tpt>
    Block(
      Apply(
        super."<init>"
        Nil
      )
      ()
    )
  )
  ClassDef( // implicit class PimpedFoo extends Object in package foo
    implicit
    "PimpedFoo"
    []
    Template(
      "java.lang.Object" // parents
      ValDef(
        private
        "_"
        <tpt>
        <empty>
      )
      // 3 statements
      ValDef( // private[this] val foo: <?> in class PimpedFoo
        private <local> <paramaccessor>
        "foo"
        "Foo"
        <empty>
      )
      DefDef( // def <init>(foo: foo.Foo): foo.package.PimpedFoo in class PimpedFoo
        <method> <triedcooking>
        "<init>"
        []
        // 1 parameter list
        ValDef( // foo: foo.Foo
          <param> <paramaccessor>
          "foo"
          "Foo" // class Foo extends Object in package foo, tree.tpe=foo.Foo
          <empty>
        )
        <tpt> // tree.tpe=foo.package.PimpedFoo
        Block(
          Apply(
            super."<init>"
            Nil
          )
          ()
        )
      )
      DefDef( // def bar: <?> in class PimpedFoo
        <method>
        "bar"
        []
        Nil
        <tpt>
        "$qmark$qmark$qmark"
      )
    )
  )
)

== Expanded type of tree ==

TypeRef(TypeSymbol(final class Unit extends AnyVal))

uncaught exception during compilation: scala.reflect.internal.FatalError
error: scala.reflect.internal.FatalError: 
     while compiling: Test.scala
        during phase: typer
     library version: version 2.10.0-20120603-142856-83434f60c4
    compiler version: version 2.10.0-20120603-142856-83434f60c4
  reconstructed args: -language:experimental.macros

  last tree to typer: Literal(Constant(()))
              symbol: null
   symbol definition: null
                 tpe: Unit
       symbol owners: 
      context owners: package package -> package foo

== Enclosing template or block ==

Template( // val <local package>: <notype> in package foo
  "java.lang.Object" // parents
  ValDef(
    private
    "_"
    <tpt>
    <empty>
  )
  // 2 statements
  DefDef( // def <init>: <?> in package foo
    <method>
    "<init>"
    []
    List(Nil)
    <tpt>
    Block(
      Apply(
        super."<init>"
        Nil
      )
      ()
    )
  )
  ClassDef( // implicit class PimpedFoo extends Object in package foo
    implicit
    "PimpedFoo"
    []
    Template(
      "java.lang.Object" // parents
      ValDef(
        private
        "_"
        <tpt>
        <empty>
      )
      // 3 statements
      ValDef( // private[this] val foo: <?> in class PimpedFoo
        private <local> <paramaccessor>
        "foo"
        "Foo"
        <empty>
      )
      DefDef( // def <init>(foo: foo.Foo): foo.package.PimpedFoo in class PimpedFoo
        <method> <triedcooking>
        "<init>"
        []
        // 1 parameter list
        ValDef( // foo: foo.Foo
          <param> <paramaccessor>
          "foo"
          "Foo" // class Foo extends Object in package foo, tree.tpe=foo.Foo
          <empty>
        )
        <tpt> // tree.tpe=foo.package.PimpedFoo
        Block(
          Apply(
            super."<init>"
            Nil
          )
          ()
        )
      )
      DefDef( // def bar: <?> in class PimpedFoo
        <method>
        "bar"
        []
        Nil
        <tpt>
        "$qmark$qmark$qmark"
      )
    )
  )
)

== Expanded type of tree ==

TypeRef(TypeSymbol(final class Unit extends AnyVal))

No synthetics for method PimpedFoo: synthetics contains 
  at scala.reflect.internal.SymbolTable.abort(SymbolTable.scala:47)
  at scala.tools.nsc.Global.abort(Global.scala:249)
  at scala.tools.nsc.typechecker.MethodSynthesis$MethodSynth$class.addDerivedTrees(MethodSynthesis.scala:253)
  at scala.tools.nsc.typechecker.Namers$Namer.addDerivedTrees(Namers.scala:76)
  at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$41.apply(Typers.scala:1734)
  at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$41.apply(Typers.scala:1734)
  at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$rewrappingWrapperTrees$1.apply(Typers.scala:1672)
  at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$rewrappingWrapperTrees$1.apply(Typers.scala:1669)
  at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:245)
  at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:245)
  at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
  at scala.collection.immutable.List.foreach(List.scala:77)
  at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:245)
  at scala.collection.AbstractTraversable.flatMap(Traversable.scala:105)
  at scala.tools.nsc.typechecker.Typers$Typer.typedTemplate(Typers.scala:1734)
  at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$40.apply(Typers.scala:1644)
  at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$40.apply(Typers.scala:1644)
  at scala.tools.nsc.typechecker.Typers$Typer.typerReportAnyContextErrors(Typers.scala:515)
  at scala.tools.nsc.typechecker.Typers$Typer.typedModuleDef(Typers.scala:1643)
  at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:4672)
  at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5033)
  at scala.tools.nsc.typechecker.Typers$Typer.typedStat$1(Typers.scala:2585)
  at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$60$$anonfun$61.apply(Typers.scala:2681)
  at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$60$$anonfun$61.apply(Typers.scala:2681)
  at scala.collection.immutable.List.loop$1(List.scala:163)
  at scala.collection.immutable.List.mapConserve(List.scala:179)
  at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$60.apply(Typers.scala:2681)
  at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$60.apply(Typers.scala:2680)
  at scala.tools.nsc.typechecker.Typers$Typer.withSavedContext(Typers.scala:524)
  at scala.tools.nsc.typechecker.Typers$Typer.typedStats(Typers.scala:2680)
  at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:4665)
  at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5033)
  at scala.tools.nsc.typechecker.Typers$Typer.typedStat$1(Typers.scala:2585)
  at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$60$$anonfun$61.apply(Typers.scala:2681)
  at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$60$$anonfun$61.apply(Typers.scala:2681)
  at scala.collection.immutable.List.loop$1(List.scala:163)
  at scala.collection.immutable.List.mapConserve(List.scala:179)
  at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$60.apply(Typers.scala:2681)
  at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$60.apply(Typers.scala:2680)
  at scala.tools.nsc.typechecker.Typers$Typer.withSavedContext(Typers.scala:524)
  at scala.tools.nsc.typechecker.Typers$Typer.typedStats(Typers.scala:2680)
  at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:4665)
  at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5033)
  at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5091)
  at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3.apply(Analyzer.scala:97)
  at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:458)
  at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3$$anonfun$run$1.apply(Analyzer.scala:89)
  at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3$$anonfun$run$1.apply(Analyzer.scala:89)
  at scala.collection.Iterator$class.foreach(Iterator.scala:724)
  at scala.collection.AbstractIterator.foreach(Iterator.scala:1152)
  at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3.run(Analyzer.scala:89)
  at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1573)
  at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1547)
  at scala.tools.nsc.Global$Run.compileSources(Global.scala:1543)
  at scala.tools.nsc.Global$Run.compile(Global.scala:1653)
  at scala.tools.nsc.Driver.doCompile(Driver.scala:31)
  at scala.tools.nsc.Main$.doCompile(Main.scala:81)
  at scala.tools.nsc.Driver.process(Driver.scala:52)
  at scala.tools.nsc.Driver.main(Driver.scala:65)
  at scala.tools.nsc.Main.main(Main.scala)

error: fatal error: 
     while compiling: Test.scala
        during phase: typer
     library version: version 2.10.0-20120603-142856-83434f60c4
    compiler version: version 2.10.0-20120603-142856-83434f60c4
  reconstructed args: -language:experimental.macros

  last tree to typer: Literal(Constant(()))
              symbol: null
   symbol definition: null
                 tpe: Unit
       symbol owners: 
      context owners: package package -> package foo

== Enclosing template or block ==

Template( // val <local package>: <notype> in package foo
  "java.lang.Object" // parents
  ValDef(
    private
    "_"
    <tpt>
    <empty>
  )
  // 2 statements
  DefDef( // def <init>: <?> in package foo
    <method>
    "<init>"
    []
    List(Nil)
    <tpt>
    Block(
      Apply(
        super."<init>"
        Nil
      )
      ()
    )
  )
  ClassDef( // implicit class PimpedFoo extends Object in package foo
    implicit
    "PimpedFoo"
    []
    Template(
      "java.lang.Object" // parents
      ValDef(
        private
        "_"
        <tpt>
        <empty>
      )
      // 3 statements
      ValDef( // private[this] val foo: <?> in class PimpedFoo
        private <local> <paramaccessor>
        "foo"
        "Foo"
        <empty>
      )
      DefDef( // def <init>(foo: foo.Foo): foo.package.PimpedFoo in class PimpedFoo
        <method> <triedcooking>
        "<init>"
        []
        // 1 parameter list
        ValDef( // foo: foo.Foo
          <param> <paramaccessor>
          "foo"
          "Foo" // class Foo extends Object in package foo, tree.tpe=foo.Foo
          <empty>
        )
        <tpt> // tree.tpe=foo.package.PimpedFoo
        Block(
          Apply(
            super."<init>"
            Nil
          )
          ()
        )
      )
      DefDef( // def bar: <?> in class PimpedFoo
        <method>
        "bar"
        []
        Nil
        <tpt>
        "$qmark$qmark$qmark"
      )
    )
  )
)

== Expanded type of tree ==

TypeRef(TypeSymbol(final class Unit extends AnyVal))

No synthetics for method PimpedFoo: synthetics contains 
@scabug
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@scabug scabug commented Jun 3, 2012

Imported From: https://issues.scala-lang.org/browse/SI-5877?orig=1
Reporter: @xeno-by
Affected Versions: 2.10.0

@scabug
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@scabug scabug commented Jul 19, 2012

@paulp said:
Even this is enough (since I just came to report this and have it handy...)

package foo { }

package object foo {
  implicit class Foo(val s: String) { }
}

@scabug
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@scabug scabug commented Nov 7, 2012

@paulp said:
Raising priority; sick of running into it already.

@scabug
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@scabug scabug commented Dec 4, 2012

@retronym said:
A workaround seems to be to use object package. What does that tell us about the bug?

package foo {
  class Foo

  // okay
  //
  // object `package` {
  //   implicit class PimpedFoo1(value: Foo)
  // }
}

package object foo {
  // No synthetics for method PimpedFoo2: synthetics contains 
  implicit class PimpedFoo2(value: Foo)
}

@scabug
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@scabug scabug commented Dec 4, 2012

@scabug scabug closed this Dec 10, 2012
@scabug
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@scabug scabug commented Dec 10, 2012

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