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Java 8 rules for method overrides:

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- 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.
This commit is contained in:
Dmitry Petrov
2015-10-07 14:43:39 +03:00
parent 82c0265cb3
commit 5d9ee7efee
46 changed files with 381 additions and 212 deletions
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compiler/testData/diagnostics/tests/override/Generics.kt
Vendored
+4 -4
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@@ -40,15 +40,15 @@ abstract class MyAbstractClass1 : MyTrait<Int>, MyAbstractClass<String>() {
override fun bar(t: String) = t
}
<!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>class MyIllegalGenericClass1<!><T> : MyTrait<T>, MyAbstractClass<T>() {}
<!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>class MyIllegalGenericClass2<!><T, R>(r : R) : MyTrait<T>, MyAbstractClass<R>() {
<!ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED!>class MyIllegalGenericClass1<!><T> : MyTrait<T>, MyAbstractClass<T>() {}
<!ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED!>class MyIllegalGenericClass2<!><T, R>(r : R) : MyTrait<T>, MyAbstractClass<R>() {
<!NOTHING_TO_OVERRIDE!>override<!> fun foo(r: R) = r
<!CONFLICTING_OVERLOADS!><!NOTHING_TO_OVERRIDE!>override<!> val <T> pr : R<!> = r
}
<!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>class MyIllegalClass1<!> : MyTrait<Int>, MyAbstractClass<String>() {}
<!ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED!>class MyIllegalClass1<!> : MyTrait<Int>, MyAbstractClass<String>() {}
abstract class MyLegalAbstractClass1 : MyTrait<Int>, MyAbstractClass<String>() {}
<!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>class MyIllegalClass2<!><T>(t : T) : MyTrait<Int>, MyAbstractClass<Int>() {
<!ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED!>class MyIllegalClass2<!><T>(t : T) : MyTrait<Int>, MyAbstractClass<Int>() {
fun foo(t: T) = t
fun bar(t: T) = t
<!CONFLICTING_OVERLOADS!>val <R> pr : T<!> = t