jdk-24/langtools/test/tools/javac/defaultMethods/Neg14.java

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/*
* @test /nodynamiccopyright/
* @summary check that a class cannot have two sibling interfaces with a default and abstract method
* @compile/fail/ref=Neg14.out -XDallowDefaultMethods -XDrawDiagnostics Neg14.java
*/
class Neg14 {
interface IA { int m(); }
interface IB { default int m() { return 1; } }
abstract class AB implements IA, IB {}
}