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Diffstat (limited to 'tests/untried/neg/t4989.scala')
-rw-r--r-- | tests/untried/neg/t4989.scala | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/tests/untried/neg/t4989.scala b/tests/untried/neg/t4989.scala new file mode 100644 index 000000000..e7ff80ed7 --- /dev/null +++ b/tests/untried/neg/t4989.scala @@ -0,0 +1,68 @@ +abstract class A0 { + def print(): String +} + +class A extends A0 { + def print(): String = "A" +} + +abstract class B extends A { + def print() : String +} + +class C extends B { + override def print(): String = super.print() // should be an error +} + +trait T extends B { + override def print(): String = super.print() // should be an error +} + +class D extends A { + override def print(): String = super.print() // okay +} + + +// it's okay do this when trait are in the mix, as the +// suitable super accessor methods are used. +object ConcreteMethodAndIntermediaryAreTraits { + trait T1 { + def print(): String = "" + } + + trait T2 extends T1 { + def print(): String + } + + class C3 extends T2 { + def print(): String = super.print() // okay + } +} + +object IntermediaryIsTrait { + class T1 { + def print(): String = "" + } + + trait T2 extends T1 { + def print(): String + } + + class C3 extends T2 { + override def print(): String = super.print() // okay + } +} + +object ConcreteMethodIsTrait { + trait T1 { + def print(): String = "" + } + + abstract class T2 extends T1 { + def print(): String + } + + class C3 extends T2 { + override def print(): String = super.print() // okay + } +} |