kotlin/compiler/testData/diagnostics/tests/java8Overrides/defaultVsAbstract.kt at d4f25e104364eaef8a9e95773cfdfd39d7c33ce2 - kotlin - Gitea: Git with a cup of tea

jlengrand/kotlin

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Dmitry Petrov 5d9ee7efee Java 8 rules for method overrides:

- base class method wins against a (default) interface method,
so an abstract base class method should always be implemented
in a derived class;

- interface methods clash regardless of abstract/default
with possibly undefined behavior at run-time,
so a class or interface should always define its own method
for methods inherited from multiple interfaces and not from base class;

- meaningful diagnostics for class inheriting conflicting JVM signatures.
Since no override will happen under Java 8 rules,
ACCIDENTAL_OVERRIDE is misleading for this case;

- update testData.

2015-10-12 14:12:31 +03:00

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Kotlin

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 interface ILeft {
     fun foo() {}
 }
 interface IRight {
     fun foo()
 }
 <!MANY_INTERFACES_MEMBER_NOT_IMPLEMENTED!>interface IDerived<!> : ILeft, IRight
 <!MANY_INTERFACES_MEMBER_NOT_IMPLEMENTED!>class CDerived<!> : ILeft, IRight
 abstract <!MANY_INTERFACES_MEMBER_NOT_IMPLEMENTED!>class ADerived<!> : ILeft, IRight