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Traits + clone = boom! #151

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scabug opened this issue Oct 3, 2007 · 7 comments
Closed

Traits + clone = boom! #151

scabug opened this issue Oct 3, 2007 · 7 comments
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@dragos
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2.7.2

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@scabug
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scabug commented Oct 3, 2007 

package test
object Main {
  trait Foo extends Cloneable {
    def copy : Foo = clone.asInstanceOf[Foo]
  }
  def main(args : Array[String]) : Unit = {
    Console.println("hello")
    val foo = new Foo {}
    Console.println(foo.copy)
  }
}

Run it and weep. All protected methods from a class that a trait extends need to be bridged, especially if the class is coming from Java.
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scabug commented Oct 3, 2007

Imported From: https://issues.scala-lang.org/browse/SI-151?orig=1
Reporter: @mcdirmid

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scabug commented Apr 22, 2008

@dragos said:
Fixed in r14773.

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scabug commented Jan 14, 2009

@odersky said:
Milestone 2.7.1 deleted

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scabug commented Oct 20, 2011

Kahli Burke (kahliburke) said:
I didn't mean to open this earlier

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scabug commented Sep 9, 2014

Andrzej Jozwik (ajozwik) said:
Possibly regression in scala 2.10/2.11/2.12
See:
http://stackoverflow.com/a/25738632/651140

// Java API
public interface JavaAPI {
  JustSomeAPISpecificType clone();
}
public enum JustSomeAPISpecificType{
INSTANCE
}

public class Factory {

        public static class JavaApiImpl implements JavaAPI{

                public JustSomeAPISpecificType clone(){
                        return JustSomeAPISpecificType.INSTANCE;
                }
        }

        public static JavaAPI getAPI(){
                return new JavaApiImpl();
        }
}

Test with sbt/scala console:

scala> val api = Factory.getAPI
api: JavaAPI = Factory$JavaApiImpl@57a645

scala> api.clone
<console>:9: error: method clone in class Object cannot be accessed in JavaAPI
 Access to protected method clone not permitted because
 prefix type JavaAPI does not conform to
 object $iw where the access take place
              api.clone

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scabug commented Jan 30, 2017

Yaroslav Nedumov (yarnedumov) said:
Hi,

According to Andrzej Jozwik's last comment this bug is reproducible again (in Scala 2.10-2.12). I didn't test 2.10 and 2.12, but I can confirm it for Scala 2.11.8.
Since it looks like Andrzej forgot to reopen bug, I am doing this.

@scabug scabug added this to the 2.7.2 milestone Apr 6, 2017
@som-snytt som-snytt mentioned this issue Sep 7, 2017
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@SethTisue
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please open a new ticket, reopening old tickets that regressed messes with milestones and such

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