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AbstractMethodError with dependent method types and generics #6443

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scabug opened this issue Sep 28, 2012 · 4 comments
Closed

AbstractMethodError with dependent method types and generics #6443

scabug opened this issue Sep 28, 2012 · 4 comments

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@scabug
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@scabug scabug commented Sep 28, 2012

object Test extends App {
  trait A {
    type D <: C
    def foo(d: D)(x: X[d.type]): Unit
    trait C { this: D =>
      def bar(x: X[D]): Unit = foo(this)(x)
    }
    class X[-F <: D]
  }
  class B extends A {
    def foo(d: D)(x: X[d.type]): Unit = ()
    class D() extends C
    new D().bar(new X[D])
  }
  new B
}

produces the following at runtime:

java.lang.AbstractMethodError: Test$B.foo(LTest$A$C;LTest$A$X;)V
        at Test$A$C$class.bar(forms.scala:6)
        at Test$B$D.bar(forms.scala:13)
        at Test$B.<init>(forms.scala:14)
        at Test$.<init>(forms.scala:16)
        at Test$.<clinit>(forms.scala)
        at Test.main(forms.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at scala.tools.nsc.util.ScalaClassLoader$$anonfun$run$1.apply(ScalaClassLoader.scala:71)
        at scala.tools.nsc.util.ScalaClassLoader$class.asContext(ScalaClassLoader.scala:31)
        at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.asContext(ScalaClassLoader.scala:139)
        at scala.tools.nsc.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:71)
        at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:139)
        at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:28)
        at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:45)
        at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:35)
        at scala.tools.nsc.ObjectRunner$.runAndCatch(ObjectRunner.scala:45)
        at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:74)
        at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:96)
        at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:105)
        at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

This is probably a duplicate of, or at least related to, #6135.

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@scabug scabug commented Sep 28, 2012

Imported From: https://issues.scala-lang.org/browse/SI-6443?orig=1
Reporter: @propensive
Affected Versions: 2.10.0-M7
See #6135

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@scabug scabug commented Dec 2, 2012

@retronym said:
Reduced a little:

trait A {
  type D >: Null <: C
  def foo(d: D)(d2: d.type): Unit
  trait C {
    def bar: Unit = foo(null)(null)
  }
}
object B extends A {
  class D extends C

  def foo(d: D)(d2: d.type): Unit = ()
}

object Test extends App {
  new B.D().bar
}
scala> :javap -private A
Compiled from "t6443.scala"
public interface A{
    public abstract void foo(A$C, A$C);
}


scala> :javap -private B$
Compiled from "t6443.scala"
public final class B$ extends java.lang.Object implements A{
    public static final B$ MODULE$;
    public static {};
    public void foo(B$D, B$D);
    private B$();
}

We're missing a bridge method in B$ with the signature public void foo(A$C, A$C).

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@scabug scabug commented Dec 3, 2012

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@scabug scabug commented Jan 8, 2013

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