https://github.com/zach-klippenstein/kotlin-interface-delegation-bug

Demo of a Kotlin compiler bug that prevents a Kotlin interface from implementing a Java interface by delegation.
https://github.com/zach-klippenstein/kotlin-interface-delegation-bug

bug demo kotlin kotlin-language

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Demo of a Kotlin compiler bug that prevents a Kotlin interface from implementing a Java interface by delegation.

• Host: GitHub
• URL: https://github.com/zach-klippenstein/kotlin-interface-delegation-bug
• Owner: zach-klippenstein
• Created: 2017-09-04T17:25:54.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2017-09-04T18:10:52.000Z (over 7 years ago)
• Last Synced: 2025-01-29T08:11:51.689Z (3 months ago)
• Topics: bug, demo, kotlin, kotlin-language
• Language: Kotlin
• Homepage: https://youtrack.jetbrains.com/issue/KT-20100
• Size: 52.7 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# kotlin-interface-delegation-bug

Filed as [KT-20100](https://youtrack.jetbrains.com/issue/KT-20100).

Demo of a Kotlin compiler bug that prevents a Kotlin interface from implementing a Java interface by delegation,

when a method on the interface accepts a boxed primitive type.

If you have a Java interface that looks like this:

```

public interface Interface {

  void doThing(@NotNull Integer arg);

}

```

And a Kotlin class that tries implementing it using delegation, like this:

```

class Implementation(delegate: Interface) : Interface by delegate {

  override fun doThing(arg: Int) {

    TODO()

  }

}

```

The Kotlin compiler will complain about conflicting overloads of the `doThing` method:

```

…/src/main/java/Implementation.kt: (3, 3): Conflicting overloads: public open fun doThing(arg: Int): Unit defined in Implementation, public open fun doThing(@NotNull arg: Int): Unit defined in Implementation

…/src/main/java/Interface.java: (4, 3): Conflicting overloads: public open fun doThing(arg: Int): Unit defined in Implementation, public open fun doThing(@NotNull arg: Int): Unit defined in Implementation

```